US1989879A - Photographic line printing - Google Patents
Photographic line printing Download PDFInfo
- Publication number
- US1989879A US1989879A US587609A US58760932A US1989879A US 1989879 A US1989879 A US 1989879A US 587609 A US587609 A US 587609A US 58760932 A US58760932 A US 58760932A US 1989879 A US1989879 A US 1989879A
- Authority
- US
- United States
- Prior art keywords
- coating
- cloth
- plasticizing agent
- tracing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000576 coating method Methods 0.000 description 52
- 239000011248 coating agent Substances 0.000 description 51
- 239000004744 fabric Substances 0.000 description 28
- 239000003795 chemical substances by application Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 13
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 230000001235 sensitizing effect Effects 0.000 description 8
- 238000004078 waterproofing Methods 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 235000019441 ethanol Nutrition 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 229920001220 nitrocellulos Polymers 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- ZVNPWFOVUDMGRP-UHFFFAOYSA-N 4-methylaminophenol sulfate Chemical compound OS(O)(=O)=O.CNC1=CC=C(O)C=C1.CNC1=CC=C(O)C=C1 ZVNPWFOVUDMGRP-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 2
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 description 1
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-UHFFFAOYSA-N 0.000 description 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical class CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000011928 denatured alcohol Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019439 ethyl acetate Nutrition 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000033458 reproduction Effects 0.000 description 1
- 239000010458 rotten stone Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
- G03C1/7642—Photosensitive materials characterised by the base or auxiliary layers the base being of textile or leather
Definitions
- the usual methods of making prints on tracing cloth include waterproofing the cloth before sensitizing, then printing and developing. Some of these methods or processes do not result in en- .tirely satisfactory prints. Often the surface of the finished print is found to be more or less glazed thus rendering the use of ink or pencil thereon difiicult. In some cases it has also been found that the printed lines are too easily removed waterproofing coatings and. obtaining a clearerv and more beautiful finished print having an even dull and smooth surface which readily takes ink 40 or pencil marks. Concerning the use of the wordglaze, it is to be observed that the object of the pre-sensitizing or second coating is not primarily to destroy the glaze which commonly appears or is present in the waterproofing coating.
- Dibutyl phthalate is plasticizer, and has already been referred to.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Feb. 5, 1935; K, u cK A 1,989,879
PHOTOGRAPHIC LINE PRINTING Filed Jan: 19, 1932 s NsmzEo EMULSION.
FLEXIBLE BASE MATERIAL 600/ As TRACING CLOTH.
FIRST COATING OF A cELLuLosE sEcoMo COATING OF'A DERWATIVE AND A PLASTlClZlNG coLorzLEss INERT POWDER,
AGENT. A PLASTICIZING AGENT/1ND A SOLVE NT- INVENTOR v ATTORNEY A PatentedFeb. 5, 1935 UNITED STATES PHOTOGBAPHIC LINE PRINTING Knud Murck, Forest Hills, N. Y., assignor to Charles Bruning Company Inc., a corporation 01' New York Application January 19, 1992, Serial No. 587,609
ficlaims.
This invention relatesto improvements in processes for preparing suitable flexible base materials such as ordinary commercial standard tracing cloth' for use in photographically reproducing 5 thereon tracings and drawings. Such reproductions are usually called black line prints on tracing cloth, the latter material being the one most commonly used. The object of the invention is to provide a superior sensitized tracing cloth as an article of manufacture whereby a more perfect dull surface is obtained for the use of ink or pencil on the finished print for purposes of alterations or additions thereto, and whereby the printed lines will adhere more closely to the tracing cloth and can only be removed with difiiculty. Another object of the invention is to provide a novel process for black line photographic printing on tracing cloth. The term tracing cloth will be used herein as a convenient designation of the flexible base material.
The usual methods of making prints on tracing cloth include waterproofing the cloth before sensitizing, then printing and developing. Some of these methods or processes do not result in en- .tirely satisfactory prints. Often the surface of the finished print is found to be more or less glazed thus rendering the use of ink or pencil thereon difiicult. In some cases it has also been found that the printed lines are too easily removed waterproofing coatings and. obtaining a clearerv and more beautiful finished print having an even dull and smooth surface which readily takes ink 40 or pencil marks. Concerning the use of the wordglaze, it is to be observed that the object of the pre-sensitizing or second coating is not primarily to destroy the glaze which commonly appears or is present in the waterproofing coating. The lat ter may not result in an objectionable glaze. But inasmuch as the waterproofing coating in and of itself repels to a greater or lesser degree the sensitizing coating, the second coating is em- 'ployed or put an to destroy this repellent actien 50 It the latter results in a glaze, then of the glaze is destroyed, but the glaze is merely a symptom or surface indication of-the waterproofing.
The accompanying drawing illustrates diagram-- 65 matically the invention-herein. The novel treator feature inherent in the waterproo seating.
ment also causes the printed lines to adhere far more closely to the tracing cloth surface.
In carrying out this invention the procedure is as follows: Ordinary tracing cloth is coated on one or both sides with a coating of suitable 6 waterproofing solution which is deposited on the tracing cloth in the form of a film. Any suitable apparatus may be used for this purpose. For instance, the tracing cloth may be passed through a bath. Thereafter the tracing cloth is dried in 10 a 'suitable drying apparatus. The waterproof solution dries on the tracing cloth into a uniform, glossy, transparent film on each side 'of the cloth.
The waterproofing solution may bemade according to the following formula: 1
Dibutyl phthalate 19 lbs. '8 oz. Butyl propionate 14 lbs. 8 oz. Ethyl lactate 8 lbs. 12 oz. Buta 3 lbs. 8 oz. w Lacquer 50 gallons Acetone 24 gallons acetates, diethyl carbonate, ethyl butyrate, amyl alcohol, toluol, or other known medium boilers or mixtures thereof.
Lacquer is a low-viscosity nitrocotton in acetone solution, the viscosity of the solution being 117-125 as determined with a MacMichael vis- 40 'cosimeter.
It may be replaced by a solution of cellulose acetate.
Acetone is a low-boiling solvent, and may be replaced wholly or partially by methyl or ethyl acetates, ethyl propionate, anhydrous ethyl alcohol, isopropyl alcohol, methanol, benzol, dichlor methane, or other known low-boilers or mixturesthereof.
form coating to the cloth on one time thereof.
Thereafter the dry waterproofed tracing cloth 5 The treating solution is made from a paste of the following typical composition.
Superfloss -e 12 oz. Dibutyl phthalate 1 lb. 2 oz. Alcohol (Formula 30) 1 pint finely-ground siliceous powders, diatomaceousearth, kieselguhr, tripoli, silicagel, barium sulfate, or other suitable inert powders or mixtures thereof.
Dibutyl phthalate is plasticizer, and has already been referred to.
Alcohol (Formula 30) is specially denatured alcohol, made by adding 10 gallons of methanol to 100 gallons of ethyl alcohol.
The effect of this treatment is to exert a mild solvent action on the waterproof film to the extent of destroying its glossy finish and then upon drying to leave deposited on the surface a matte, but transparent, layer of re-deposited nitrocotton mixed with a fine inert solid powder and plasticizer, the two latter being derived from the treating mixture. The special treating solution has no chemical action on the waterproofing film; the action is physical. The treating solution partially dissolves the cellulose nitrate and dibutyl phthalate in the surface 'of the waterproof film and upon application of heat, the solvent alcohol evaporates, re-depositing this cellulose nitrate and dibutyl phthalate mixed with more dibutyl phthalate and superfloss from the treating solution.
The object of this treatment is to make the Waterproof surface of the cloth so receptive to the sensitizing solution that the printed line resulting therefrom can be erased or chipped off only with the greatest difficulty; and also to make the surface more receptive to ink and pencil.
Thereafter the treated face of the cloth is coated with a light sensitive emulsion, by passing it over a coating roller which in rotating dips into a tank of the emulsion and carries up and applies to the face of the cloth a thin, uniform layer of the emulsion. After this coating has been applied in this fashion, the cloth is dried by passage thru a drying box.
A typical formula for the sensitizing emulsion follows:
Glue 110 grams Potassium bichromate 12 Silver nitrate 90 Potassium chloride 40 The sensitized tracing cloth is now a finished article of manufacture which may be stored, shipped andused in the trade in the same manner as other similar sensitized layers are handled and used commercially.
The process thereafter of making a print is carried out as follows. The negative which is obtained in the usual manner is placed against the sensitized face of the tracing cloth, exposed to light and a print is made. Thereafter the print on the sensitized tracing cloth is washed with water to remove the sensitized coating from the unexposed portions of the print. That is, the
coating which was under the opaque portions of the negative is washed away. Swabbing with a wad of wet. absorbent cotton hastens this operation and insures its completeness. The next step in the process is the developing of the print which is done by placing the print in a developing bath which may consist of Sodium carbonate (soda ash) 4 oz. Sodium sulfite 4oz. Hydroquinone oz. Monomethylparaminophenol sulfate oz.
The latter chemical is sold under a variety of trade names such as metol, pictol, rhodol, and others.
After having been developed the print is again washed to remove all surplus developer and then dried.
The finished print is waterproof and the tracing cloth regains its natural appearance and characteristics. It is a black line positive print on tracing cloth having a superior appearance and all the characteristics of an ordinary tracing on tracing cloth.
I claim:
1. As a new article of manufacture, a flexible sensitized photographic line print sheet comprising a flexible base material; a coating thereon consisting of a cellulose derivative and a plasticizing agent; a second coating on said first coating, said second coating consisting of an inert powder and a plasticizing agent and a sensitizing coating on said second coating.
2. As a new article of manufacture, a flexible sensitized photographic line print sheet having a matte receptive surface comprising a flexible base material; a coating thereon consisting of a cellulose derivative and a plasticizing agent; a second coating on said first coating, said second coating consisting of an inert powder and a plasticizing agent and a sensitizing coating on said second coating.
3. As a new article of manufacture, a flexible sensitized photographic line print sheet comprising a flexible base material; a coating thereon consisting of a cellulose derivative and a plasticizing agent; a second coating on said first coating, said second coating consisting of an inert powder and a plasticizing agent and a sensitizing coating on said second coating consisting of a glue-bichromate mixture impregnated with a silver salt.
4. The method of preparing a suitable flexible base material for photographic line printing which consists in placing on said base material a first coating including a cellulose derivative and a plasticizing agent whereby'to waterproof the same; placing a second coating on the first coating, said second coating consisting of a colorless inert powder, a plasticizing agent and a solvent whereby to partially dissolve said first coating; applying heat to cause the said partially dissolved portion of the said first coating to be redeposited in admixture with the said inert powder and plasticizing agent to render said material receptive to a light sensitive coating and finally placing a light sensitive coating on said second coating.
5. The method of preparing a suitable flexible base material for photographic line printing which consists in placing on said base material ing, said second coating consisting of a colorless inert powder, a plasticizing agent and a solvent whereby to partially dissolve said first coat.- ing; applyin heat to cause the said partially dissolvedportionoithe saidfirstcoatingtobe redeposited in admixture with the said inert powder and plasticizing agent to render said material receptive to a light sensitive coating and finally placing on said second coating a light sensitive coating consisting 01 a glue-bichromate mixture impregnated with a silver salt.
6. The method of preparing a suitable flexible base material to receive a light sensitive coating for photographic line printing which consists in placing on said base'material a first coating including a cellulose derivative and a plasticising agent whereby to waterproof the same; placing a second coating on the first coating, said second coating consisting of a colorless inert powder, a plasticizing agent and a solvent whereby to partially dissolve saidiirst coating and applying heat to cause the said partially dissolved portion of the said first coating to be redeposited in admixture with the said inert powder and plasticizing agent.
. KNUD MURCK.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US587609A US1989879A (en) | 1932-01-19 | 1932-01-19 | Photographic line printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US587609A US1989879A (en) | 1932-01-19 | 1932-01-19 | Photographic line printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1989879A true US1989879A (en) | 1935-02-05 |
Family
ID=24350482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US587609A Expired - Lifetime US1989879A (en) | 1932-01-19 | 1932-01-19 | Photographic line printing |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1989879A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2433515A (en) * | 1945-04-18 | 1947-12-30 | H P Andrews Paper Company | Method of making photographic paper |
| US2566709A (en) * | 1947-10-30 | 1951-09-04 | Gen Aniline & Film Corp | Diazotype photoprinting materials containing colloidal silica |
| US2626867A (en) * | 1947-12-04 | 1953-01-27 | Du Pont | Light-sensitive photographic element |
| DE955110C (en) * | 1952-06-28 | 1956-12-27 | Gen Aniline & Film Corp | Blueprint material for the diazotype process and process for its production |
| DE1002623B (en) * | 1951-07-18 | 1957-02-14 | Gen Aniline & Film Corp | Process for the production of diazotype material |
| US2805159A (en) * | 1953-03-02 | 1957-09-03 | Methods for the production of diazotype | |
| DE973579C (en) * | 1952-03-27 | 1960-03-31 | Kalle & Co Ag | Method for producing blueprint material |
| US3155511A (en) * | 1960-08-26 | 1964-11-03 | Andrews Paper & Chem Co Inc | Precoated diazo reproduction paper |
-
1932
- 1932-01-19 US US587609A patent/US1989879A/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2433515A (en) * | 1945-04-18 | 1947-12-30 | H P Andrews Paper Company | Method of making photographic paper |
| US2566709A (en) * | 1947-10-30 | 1951-09-04 | Gen Aniline & Film Corp | Diazotype photoprinting materials containing colloidal silica |
| DE965674C (en) * | 1947-10-30 | 1957-06-13 | Gen Aniline & Film Corp | Diazotype material |
| US2626867A (en) * | 1947-12-04 | 1953-01-27 | Du Pont | Light-sensitive photographic element |
| DE1002623B (en) * | 1951-07-18 | 1957-02-14 | Gen Aniline & Film Corp | Process for the production of diazotype material |
| DE973579C (en) * | 1952-03-27 | 1960-03-31 | Kalle & Co Ag | Method for producing blueprint material |
| DE955110C (en) * | 1952-06-28 | 1956-12-27 | Gen Aniline & Film Corp | Blueprint material for the diazotype process and process for its production |
| US2805159A (en) * | 1953-03-02 | 1957-09-03 | Methods for the production of diazotype | |
| US3155511A (en) * | 1960-08-26 | 1964-11-03 | Andrews Paper & Chem Co Inc | Precoated diazo reproduction paper |
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