CN1143131A - Method for removing resin from mixing tropical hard wood pulp - Google Patents
Method for removing resin from mixing tropical hard wood pulp Download PDFInfo
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- CN1143131A CN1143131A CN96108962A CN96108962A CN1143131A CN 1143131 A CN1143131 A CN 1143131A CN 96108962 A CN96108962 A CN 96108962A CN 96108962 A CN96108962 A CN 96108962A CN 1143131 A CN1143131 A CN 1143131A
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- density
- hydrocyclone
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- pollutant
- paper pulp
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- 229920005989 resin Polymers 0.000 title claims abstract description 28
- 229920001131 Pulp (paper) Polymers 0.000 title claims description 40
- 239000011121 hardwood Substances 0.000 title claims description 34
- 238000000034 method Methods 0.000 title claims description 34
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000003344 environmental pollutant Substances 0.000 claims description 27
- 231100000719 pollutant Toxicity 0.000 claims description 27
- 239000000835 fiber Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims 2
- 239000012895 dilution Substances 0.000 claims 2
- 238000007865 diluting Methods 0.000 claims 1
- 239000000123 paper Substances 0.000 description 36
- 239000002516 radical scavenger Substances 0.000 description 29
- 238000000926 separation method Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000004061 bleaching Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
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- 238000004804 winding Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009342 intercropping Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
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Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
- D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The present invention relates to improve qualities of pulp made from a mixed tropical broad-leaved tree. In order to remove a pitch and a resin from a mixed tropical road-leaved pulp, the two continuously connected hydrocyclones for first high density are used. The flow of the removed material from the high-density hydrocyclones is treated by the two second hydrocyclones. The flow of the removed material from the second hyrocyclones is successively treated by two continuously connected third hydrocyclones. The output of the hydrocyclones for first high density is sent to the two continuously connected hydrocyclones for low density.
Description
Equipment and method that the present invention puts it briefly and relates to clean paper making paper pulp are particularly used the equipment and the method for hydrocyclone.
The paper making pulp that makes from timber or salvage material is often polluted by particulate, and this has reduced the quality of the paper that is made by its fiber.Pollutant generally is divided into high density pollutant and low-density pollutant, and the high density pollutant comprises sand, red ink paste used for seals particulate, fragment and bark particulate.But it is disclosed in the U.S. Pat 5,240,115 as Lanace profit people such as (Crossley): as to have proved that hydrocyclone can remove the high density pollutant efficiently from slurry.
Pulp material also may be by the low-density contaminants, particularly when raw material when the paper that reclaims or cardboard make.The low-density pollutant comprises wax, hot melt material, polystyrene and polyethylene.These and other low-density pollutant and plastics can cause many troubles in paper.They not only pollute finished product, and can be bonded on cylinder, felt pan and the carpet veneer of paper machine, thereby need to replace more frequently felt pan and carpet veneer.And the gathering of cohesive material can cause often breaking of paper on the paper machine.
When paper was winding on the reel of paper machine one end, paper generally was under the high temperature.Because have the existence of low-melting low density material, it will cause bonding part (stickies), stick together in this bonding part adjacent layers of paper.When reel was rewound, the bonding part that forms in the paper bobbin can cause breaking of paper.And, because the bonding part can cause paper to ribbon, thereby reduce the quality of paper.In order to reduce the generation of these problems, improved hydrocyclone has been used to remove the lightweight pollutant from paper making pulp.A kind of type especially easily is the single flow scavenger, and it can obtain from Jones branch of the Da Erdunbeiluoyite company of Massachusetts.
In the manufacturing of paper, the paper pulp fiber that obtains from multiple channel is used as original material.Original material comprises cork, hardwood, bamboo, fiber crops and even sugarcane scrap.Every kind of material all has own unique characteristic.Along with the paper science technology constantly develops, new and old technology all is used to the various paper pulp of purifying to produce better the paper of various materials cheaply.
The paper making raw material that is made by the Malaysia and the mixing tropical hard wood of other torrid areas is proved to be special trouble.The paper pulp that makes from these timber is polluted by resin particle, fractionlet and some resiniferous fiber shells.Showed about these experiment works that mix tropical hard wood in the past: the dispersion energy of resin reduces its influence directly perceived (visual impact) to sample.Yet such dispersion is very expensive, because the equipment of its need strong power reaches the effect of dispersion.Usually, by using the high-density separation device to come from wood fibre, to remove resin.Under the situation of mixing tropical hard wood, this method is proved and is not very effective.
Like this, just need a kind of method to be used for improving from mixing the pulp quality that tropical hard wood makes.
Method of the present invention is used for handling by mixing the paper pulp that tropical hard wood makes.The method is used two kinds of hydrocyclones.First kind of optimum removed high density material, and second kind of optimum removed low density material.The hydrocyclone of removal high density material is the Massachusetts preferably, the ripple west stream (POSIFLOW of Bei Luoyite Jones branch of Da Erdunbeiluoyite company
TM) scavenger.Low-density waterpower cyclone is wanted preferred single flow (UNIFLOW) scavenger, and it can obtain with Bei Luoyite Jones branch of Bei Luoyite company.The method for optimizing that cleans out resin from the tropical hard wood pulp that mixes comprises that the first level high-density hydrocyclone by two series connection is a converting pulp in 0.7% to 0.8% the raw material in a density.Handle by two second level hydrocyclones again from the discharge liquor that the high density hydrocyclone comes out.Handle through the third level hydrocyclone of two series connection successively again from the discharge liquor that second level hydrocyclone comes out.Just the discharge liquor of level high-density hydrocyclone is sent to the low-density waterpower cyclone of two series connection.Effluent is substantially free of pitch and resin.The discharge liquor of second level hydrocyclone is diluted to 0.6% density, and is sent to elementary hydrocyclone, and between thinning to 0.5% to 0.6% density of the discharge liquor of third level hydrocyclone, and is sent to charging place of second level hydrocyclone.The discharge liquor of third level high density scavenger and two low-density scavengers is sent to cleaner, so that water can and re-use by filtering.
Characteristics of the present invention are for providing a kind of method of removing pitch and resin from the paper pulp that the mixing tropical hard wood is made.
Another characteristics of the present invention provide a kind of method of purifying mixing tropical hard wood pulp, so that the felt pan on the paper machine of this paper pulp of prolongation use and the life-span of carpet veneer.
Another characteristics of the present invention are to improve the quality and the outward appearance of the paper that is made by the mixing tropical hard wood.
With reference to the detailed description of accompanying drawing, another object of the present invention, characteristics and advantage will be more obvious by hereinafter.
Fig. 1 is the general flow chart of the inventive method.
Fig. 2 is the cutaway view of high density hydraulic cyclone scavenger used in the method shown in Figure 1.
Fig. 3 is the cutaway view of low-density waterpower eddy flow scavenger used in the method shown in Figure 1.
With reference to Fig. 1～3, wherein identical label indication same parts, first kind of hydrocyclone 20 is shown in Figure 2.Hydrocyclone 20 is designed to remove the high density pollutant from the paper making raw material logistics, the hydraulic cyclone device 22 shown in Fig. 3 is designed to remove low-density particles contact scar thing from the paper making raw material logistics.
Yet, handle and to comprise from the method for knowing of mixing the paper pulp that tropical hard wood makes and to remove high density material or dispersion resin to reduce its influence directly perceived.Resin generally is a high density material, and those those skilled in the art generally remove resin by a high density cleaning device when design cleaning paper sizing device.Thereby former experience and those skilled in the art's experience can be tending towards by using the high-density separation machine to remove resin from fibrous raw material, because resin high density material normally.In fact, most of visible resin is all removed from the paper pulp that the mixing tropical hard wood makes by resembling high-density separation machine shown in Figure 2.
Yet studies show that, mix the resin that tropical hard wood includes very wide density range, extend to less density, and the low-density resin particulate often is light color from greater density, thereby, when intuitively assaying paper pulp, be not easy to realize them.In fact, the easiest method of realizing light lightweight resinous principle is the separation process by low-density seperator shown in Figure 3, and former experience points out that it is invalid to removing resin, thereby, do not take this method usually.
Have been found that: after bleaching and processing, these faint yellow or light lightweight resin particles are the reasons that cause dark color spots and make the paper integral color deepening of producing.And the quality how light color that those are difficult to the naked eye realize in paper pulp, low density material influence paper really the cutter reason it be unclear that.But realize: these resin small particles just gather during by paper-making process.When this taking place when coalescent, it is more visible that particulate becomes, and the little dust particle or they are darkened through the color development reaction of may adhering, thereby produce dark color spots in finished product.The pH value cataclysm may influence the characteristic of resin aborning, so that it becomes invisible in acid loop (acid loop).
It is also helpful to the performance that improves paper machine to remove the lightweight resin Composition.Resin material accumulates on felt pan and the carpet veneer, and this requires often to change felt pan and carpet veneer and frequent cleaning roller surface.And light components can produce the bonding part.These bonding parts are undesirable, and particularly when hot paper was winding on the reel, fusible component can make adjacent layers of paper stick together.
Invisible, the discovery of the characteristic of low-density resin has caused handling the solution that is made paper pulp by the mixing tropical hard wood with high density and low-density waterpower eddy flow scavenger.Here, high density material refers to the material that density is bigger than pulp density, and pulp density approximately is 1; Low density material refer to density than the little material of pulp density or than 1 little material.
Being present in the pollutant that mixes in the tropical hard wood pulp mainly is pitch and the resin of proportion in 0.93 to 1.1 scope.Handle the operation of mixing tropical hard wood pulp by high density and low-density scavenger and can be placed on bleaching front or back enforcement.The bleaching before carry out more better because the removal of pollutant can reduce the consumption of the necessary chemical substance of bleached pulp.
Cleaning is mixed tropical hard wood pulp and the high density hydrocyclone can be arranged at after the low-density waterpower cyclone, also low-density waterpower cyclone can be placed after the high density hydrocyclone.Resemble the low-density scavenger of single flow scavenger 22,, thickened the soup and accepted paper pulp and from paper pulp, removed the air of being carried secretly to a certain extent because its very low quality is discharged flow rate.
Will be after cleaning at paper pulp with the place of gravity decker or other similar devices thickening, if the single flow scavenger is placed on before the thickener, the multiviscosisty of single flow low-density scavenger and degassing characteristic just can be utilized.
Because some paper pulp lose from high density hydrocyclone 28 in company with the heavy material of 34 li of discharge liquors, so wish with second and the third level high density scavenger fibre weight that reduces to lose in the reset procedure.On the other hand, contain fiber seldom in the discharge liquor from low-density scavenger 22, its density changes between 0.01% and 0.02%, and contained fiber is very thin, and it is almost useless in papermaking processing.The use of second level low-density scavenger will be taken all factors into consideration the production capacity of whole system, thereby, if when not needing the low capacity cleaner, should not adopt second level low-density scavenger.
Removing the best approach of resin from the paper pulp that the mixing tropical hard wood makes has carried out roughly describing in Fig. 1.Density is that 0.7% to 0.8% charging is fed to the charging aperture 24 of first elementary hydrocyclone 60 from a feed source 58, acceptable solution 31 leaves the discharging opening 32 of first elementary hydrocyclone 60, is sent in the charging aperture 24 of second elementary high-density separation device 62 again.
The acceptable solution 31 of second elementary high-density separation device 62 flow to the charging aperture 40 of first order low-density separator 64.The acceptable solution of first order low-density separator 64 flow to second level low-density separator 64.The acceptable solution 39 of second level low-density separator 64 is supplied to the going out in the material source 68 of sweep-out method of Fig. 1 explanation.Discharging can be sent in the such thickener 70 of as shown in Figure 1 gravity decker then.
The filter 72 that the efflux flow 50 common employings of the first order and second level low-density separator 64 resemble the floating filter of dissolved air shown in Figure 1 carries out the filtering processing.After filtering, water can reuse in paper.
Just the efflux flow 34 of level high- density hydrocyclone 60,62 is fed in the second level high density hydrocyclone 76 of two series connection by the density of thin up to about 0.6% again.The discharge liquor 34 of second level hydrocyclone 76 water 74 again is diluted to 0.5%～0.6% density, is fed to then in the third level high density scavenger 80.The discharge liquor 34 of third level scavenger 80 is provided to cleaner 72, so that filtering and re-using.The output liquid of second level high density cleaning machine 76 is sent to the charging aperture 24 of elementary scavenger 60,62 with the feed in feed source 58.The output liquid of third level scavenger 80 is sent to the charging aperture 24 of second level scavenger 76.
Making test paper pulp from the mixing tropical hard wood and be processed into the process of paper, use a series of tests of two Tai Boxi streaming high density hydrocyclones and two single flow low-density waterpower cyclones (they all obtain from Bei Luoyite Jones branch) to show, both produced the brightness increment of a bit, obtained again on color from yellow (+b) extremely blue (change b).
Certainly, the indicated method of Fig. 1 can not only be removed visible scrap, such as training the scrap that (Tappie) dispersimeter measuring device is measured by tower, and can remove faint yellow particulate, they are not in the scope that the dispersimeter measuring device is measured, but when they passed through paper-making process, meeting under a cloud caused quality problems.In addition, the method can be used for brown stock, but preferably uses the bleaching raw material, so that reduce to bleach the amount of required chemical substance.
Though preferably the low-density scavenger is placed after the high density scavenger, the low-density scavenger can be handled to the high density scavenger by discharging pulp.In some cases, may more wish with the super high density scavenger of ripple west stream.They are provided by Jones branch of Bei Luoyite company, and open in people's such as Leiderkranz's profit United States Patent (USP) 5,240,115, and are incorporated with for referencial use at this.
Removing the step of high-density component and low-density fraction can carry out in the hydrocyclone of the remodeling of single suitable design simultaneously.This knows to one skilled in the art.
" mixing tropical hard wood " this speech is used terms of those skilled in the art, and at this, its expression is used in raw material on the paper industry, refer generally to not select seeds cut tropical forest region and product, thereby will comprise a variety of tropical hard wood fibers.And method disclosed herein is used to mix tropical hard wood pulp in general.The method is in tropical hard wood experimental period intercropping has been mixed in Malaysia development.
Certainly, the proportion that mixes tropical hardwood fiber is near 1, but sometimes may be bigger or slightly littler than 1 slightly than 1.The hydrocyclone that is used to remove the hydrocyclone of high density particulate and is used to remove the low-density particulate can be adjusted with method well known to those skilled in the art, so that remove than fiber than great or little particulate.Thereby although high density refers generally to proportion greater than 1, and low-density refers generally to proportion less than 1, and in fact, high low-density difference must be wanted without hindrance by the proportion at the fiber of the hydrocyclone of this discussion with reference to those.
Certainly, the present invention is not limited in the special tectonic of this explanation and description and arrangements of components, also is included in the flexible program in the following claims scope.
Claims (6)
1, a kind of raising by the method for quality of mixing the prepared paper of tropical hard wood, it comprises the following steps:
Dilution is by mixing the paper pulp that tropical hard wood makes, and making its density is about 0.7% to about 0.8%;
Provide the paper pulp that diluted to remove the high density pollutant by a first order device;
In for the first order device of removing the high density pollutant, from the paper pulp logistics, remove the high density pollutant and export paper pulp;
Guiding is in the output liquid to one of the first order device of removing the high density pollutant device for removal low-density pollutant; With
In for the device of removing the low-density pollutant, remove the low-density pollutant.
2, the method for claim 1 is characterized in that: comprise one first hydrocyclone and one the second hydrocyclone supply of paper pulp by connecting of will dilute by a step for the first order device of removal high density pollutant.
3, the method for claim 1 is characterized in that: the step of removing the low-density pollutant comprises makes the paper pulp that diluted at least by two hydrocyclones that are connected in series.
4, a kind of raising by the method for quality of mixing the prepared paper of tropical hard wood, it comprises with at least one hydrocyclone removes pitch and resin from the mixing torrid zone hardwood fiber that suspends in water, in hydrocyclone, density is about 0.93 to 1.1 pitch and resin and is separated from fiber.
5, a kind of method of removing pitch and resin from the paper pulp that the mixing tropical hard wood makes comprises the following steps:
To be provided to first hydrocyclone by the paper pulp that the mixing tropical hard wood makes;
Raw material is placed under the centrifugal acceleration effect, isolate and be included in the density material bigger in the raw material than paper pulp;
Collect in paper pulp dilute than the low-density part, it is fed to and first second identical hydrocyclone of hydrocyclone cardinal principle;
The output liquid of second hydrocyclone is fed to the 3rd hydrocyclone; From diluted pulp, remove the part lighter than paper pulp;
The output liquid of the 3rd hydrocyclone is fed to the 4th hydrocyclone, and it is identical substantially with the 3rd hydrocyclone, thereby obtains a raw material, and wherein big or little than this material density all components all has been removed.
6, a kind of raising by the method for quality of mixing the prepared paper of tropical hard wood, it comprises the following steps:
Dilution makes its density be about 0.7% to 0.8% by mixing the paper pulp that tropical hard wood makes;
Provide the pulp feed of diluting by a device for removal low-density pollutant;
In for the device of removing the low-density pollutant, from the paper pulp logistics, remove the low-density pollutant;
In the device of output liquid to one for removal high density pollutant of guiding for the device of removal low-density pollutant;
In second table apparatus, remove the high density pollutant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42376395A | 1995-04-17 | 1995-04-17 | |
| US423,763 | 1995-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1143131A true CN1143131A (en) | 1997-02-19 |
Family
ID=23680086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96108962A Pending CN1143131A (en) | 1995-04-17 | 1996-04-17 | Method for removing resin from mixing tropical hard wood pulp |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2787669B2 (en) |
| KR (1) | KR960037956A (en) |
| CN (1) | CN1143131A (en) |
| AU (1) | AU703599B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115702272A (en) * | 2020-06-16 | 2023-02-14 | 凯米拉公司 | Method for controlling resin during bleaching |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035069B2 (en) * | 1977-07-07 | 1985-08-12 | 株式会社大和真空工業所 | electrostatic display device |
| SE434709B (en) * | 1981-12-04 | 1984-08-13 | Celleco Ab | HYDROCYCLONE CLONER FOR PURPOSING PENSION SUSPENSION WITH HIGH FIBER CONTENT |
| JPS59125993A (en) * | 1982-12-28 | 1984-07-20 | 三菱製紙株式会社 | Dust removing method |
| FI77066C (en) * | 1987-09-01 | 1989-01-10 | Ahlstroem Oy | Method and apparatus for purifying pulp suspension |
| JPH0681287A (en) * | 1992-09-01 | 1994-03-22 | Tokai Pulp Kk | Method for removing lightweight foreign material in pulp |
| US5707489A (en) * | 1993-05-26 | 1998-01-13 | J.M. Voith Gmbh | Processing wastepaper containing waxes, hot melts and adhesives |
-
1996
- 1996-04-16 JP JP8093720A patent/JP2787669B2/en not_active Expired - Lifetime
- 1996-04-16 KR KR1019960011406A patent/KR960037956A/en not_active Abandoned
- 1996-04-17 AU AU50714/96A patent/AU703599B2/en not_active Ceased
- 1996-04-17 CN CN96108962A patent/CN1143131A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115702272A (en) * | 2020-06-16 | 2023-02-14 | 凯米拉公司 | Method for controlling resin during bleaching |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09105090A (en) | 1997-04-22 |
| KR960037956A (en) | 1996-11-19 |
| AU703599B2 (en) | 1999-03-25 |
| JP2787669B2 (en) | 1998-08-20 |
| AU5071496A (en) | 1996-10-31 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |