DE958150C - Optical glass - Google Patents
Optical glassInfo
- Publication number
- DE958150C DE958150C DEJ8259A DEJ0008259A DE958150C DE 958150 C DE958150 C DE 958150C DE J8259 A DEJ8259 A DE J8259A DE J0008259 A DEJ0008259 A DE J0008259A DE 958150 C DE958150 C DE 958150C
- Authority
- DE
- Germany
- Prior art keywords
- optical glass
- content
- glass according
- zro
- tho
- 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
Links
- 239000005304 optical glass Substances 0.000 title claims description 16
- 239000011521 glass Substances 0.000 claims description 27
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 claims description 4
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 2
- 239000010428 baryte Substances 0.000 claims description 2
- 229910052601 baryte Inorganic materials 0.000 claims description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 claims 5
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims 3
- 229910003452 thorium oxide Inorganic materials 0.000 claims 3
- 229910052746 lanthanum Inorganic materials 0.000 claims 2
- 229910000464 lead oxide Inorganic materials 0.000 claims 2
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 claims 2
- 229910052776 Thorium Inorganic materials 0.000 claims 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims 1
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 5
- 238000007792 addition Methods 0.000 description 4
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Inorganic materials [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- CFEAAQFZALKQPA-UHFFFAOYSA-N cadmium(2+);oxygen(2-) Chemical compound [O-2].[Cd+2] CFEAAQFZALKQPA-UHFFFAOYSA-N 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 ThO 2 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- HUTDDBSSHVOYJR-UHFFFAOYSA-H bis[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphaplumbetan-2-yl)oxy]lead Chemical compound [Pb+2].[Pb+2].[Pb+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O HUTDDBSSHVOYJR-UHFFFAOYSA-H 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 231100000925 very toxic Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/14—Silica-free oxide glass compositions containing boron
- C03C3/142—Silica-free oxide glass compositions containing boron containing lead
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
- C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
- C03C3/074—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/14—Silica-free oxide glass compositions containing boron
- C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
- C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Description
AUSGEGEBEN AM 14. FEBRUAR 1957ISSUED FEBRUARY 14, 1957
. J8259IVc132b . J8259IVc132b
Marga Faulstich, MainzMarga Faulstich, Mainz
ist als Erfinder genannt wordenhas been named as the inventor
Optisches GlasOptical glass
Die Erfindung bezieht sich auf ein optisches Glas, welches derart zusammengesetzt ist, daß es eine hohe Brechungszahl · nd aufweist, die größer als 1,745 ist, und welches eine beträchtlich geringere Lichtstreuung besitzt als die üblichen S chwerfl intgläser.The invention relates to an optical glass which is composed in such a way that it has a high refractive index · n d which is greater than 1.745, and which has considerably less light scattering than conventional heavy-duty glasses.
Es sind Gläser dieser Art bekannt, die in derThere are glasses of this type known in the
Hauptsache aus Bleiphosphat bestehen. Diese Gläser sind zwar durchaus farblos, jedoch soMainly consist of lead phosphate. These glasses are absolutely colorless, but like this
ίο weich, daß ihre Verwendung für optische Zwecke . nur bedingt möglich ist.ίο soft that their use for optical purposes . is only possible to a limited extent.
Es sind auch schon harte Gläser mit hoher Brechungszahl vorgeschlagen worden, die unter Verwendung großer Mengen von seltenen Erden gemeinsam mit Tantal oder Niob und Borsäure erschmolzen wurden. Diese Gläser sind jedoch sehr kostspielig.Hard glasses with a high refractive index have also been proposed, those below Use of large amounts of rare earths together with tantalum or niobium and boric acid were melted. However, these glasses are very expensive.
Hochbrechende Gläser mit mittlerer Streuung wurden auch durch Zusätze von Cadmiumoxyd erhalten. Die Verwendung von Cadmiumoxyd ist ao jedoch ebenfalls verhältnismäßig kostspielig und zudem wegen' seiner großen Giftigkeit bei der Handhabung unerwünscht.High refractive index glasses with medium scattering were also made possible by the addition of cadmium oxide obtain. However, the use of cadmium oxide is also relatively expensive and also undesirable because of its great toxicity in handling.
Bekanntgeworden sind auch Gläser des Systems PbO-ZnO-B2O3. Diese Gläser haben sich aber für die Herstellung von optischem Glas als völlig ungeeignet erwiesen, da sie wegen ihrer äußerst geringen Viskosität bei der Gußtemperatur zuGlasses of the PbO-ZnO-B 2 O 3 system have also become known. However, these glasses have proven to be completely unsuitable for the production of optical glass, since they increase due to their extremely low viscosity at the casting temperature
starker Schlierenbildung neigen. Mit den bekannten Gläsern war es auch nicht möglich, optische Werte mit hohen Brechungszahlen und geringer Lichtstreuung zu erhalten.tend to form streaks. With the known glasses it was also not possible to achieve optical values with high refractive indices and low light scattering.
Durch die Erfindung wird nun ein optische; Glas geschaffen, welches die Nachteile der bekannten Glasarten nicht aufweist und zudem weitere Vorteile mit sich bringt. Es wurde nämlich gefunden, daß sich sehr preisgünstige Gläser desThe invention is now an optical; Glass created, which has the disadvantages of the known Does not have glass types and also has other advantages. Because it was found that very inexpensive glasses des
ίο Systems PbO-ZnO-B2O3 hoher Brechung und mittlerer Dispersion, d. h. Gläser, die eine Brechungszahl nd~> 1,745 und eine Abbesche Zahlz/tf zwischen 42 und 29 aufweisen und bei denen zwischen nd und ν die Bedingungenίο Systems PbO-ZnO-B 2 O 3 of high refraction and medium dispersion, ie glasses that have a refractive index n d ~> 1.745 and an Abbe numberz / tf between 42 and 29 and where the conditions are between n d and ν
nd > 2,513 — 0,0239 ν und nd> 1,943 —0,0055 σ n d > 2.513-0.0239 ν and n d > 1.943-0.0055σ
gelten, erfindungsgemäß erhalten lassen, wenn sie folgende Zusammensetzung besitzen:apply, can be obtained according to the invention if they have the following composition:
PbO i8bis6o«/oPbO 18 to 6o «/ o
. ZnO -..·... 3 bis 15%. ZnO - .. · ... 3 to 15%
B2O3 22bis35°/oB 2 O 3 22 to 35%
La2O3 ο bis 30%La 2 O 3 ο up to 30%
ThO2 ο bis i5«/oThO 2 o to i5 «/ o
ZrO2 ο bis 5V0ZrO 2 ο to 5V0
Erdalkalien .... ο bis 20%Alkaline earths .... ο up to 20%
SiO2 obisioVoSiO 2 obisioVo
Die Gehalte an SiO2 und B2O3 liegen im allgemeinen bei etwa 25 bis 30 °/&, der Gehalt an La2 O3+ Th O2 zusammen bei weniger als 30% und die Summe von La2O3, ThO2 + PbO über 40%> (bis 70%).The contents of SiO 2 and B 2 O 3 are generally around 25 to 30%, the content of La 2 O 3 + Th O 2 together is less than 30% and the sum of La 2 O 3 , ThO 2 + PbO over 40%> (up to 70%).
Es sind zwar an sich Zusätze wie La2O3, ThO2, ZrO2 zu optischen Gläsern bekannt, jedoch besaßen die bekannten Gläser mit diesen Zusätzen eine andere optische Lage als der Erfindung zugründe liegt. Zudem entsprechen die Gehalte an den Zusätzen und den übrigen Bestandteilen nicht derjenigen gemäß der Erfindung. Insbesondere sind für ein Glas gemäß der Erfindung die bekannten hohen Kieselsäure- und Bariumoxydzusätze sowie ein Zusatz des sehr giftigen Berrilliumoxyds, wie es die bekannten Gläser aufweisen, nicht geeignet.Additives such as La 2 O 3 , ThO 2 , ZrO 2 to optical glasses are known per se, but the known glasses with these additives had a different optical position than the basis of the invention. In addition, the contents of the additives and the other constituents do not correspond to those according to the invention. In particular, the known high additions of silicic acid and barium oxide and an addition of the very toxic beryllium oxide, such as the known glasses have, are not suitable for a glass according to the invention.
Es hat sich gezeigt, daß besonders günstige Gläser erhalten werden, bei denen die Summe von La2 O3+ Th O2+ Pb O über 45°/o ansteigt. Diese Gläser weisen eine besonders hohe Brechungszahl auf. It has been shown that particularly inexpensive glasses are obtained in which the sum of La 2 O 3 + Th O 2 + Pb O increases by more than 45%. These glasses have a particularly high refractive index.
Im Interesse einer guten Stabilität gegen Kristallisation empfiehlt es sich, den Barytgehalt nicht über 15%, den CaO-Gehalt nicht über 10% und den SrO-Gehalt nicht über 15% ansteigen zu lassen.In the interests of good stability against crystallization, it is advisable to check the barite content not more than 15%, the CaO content not more than 10% and not to let the SrO content rise above 15%.
Zur Verbesserung der chemischen Resistenz und der Stabilität gegen Kristallisation soll der ZrO2-Gehalt nicht unter 2% absinken.To improve the chemical resistance and the stability against crystallization, the ZrO 2 content should not drop below 2%.
Eine weitere Stabilität gegen Kristallisation wird erreicht, wenn der Kieselsäuregehalt unter 6 % bleibt. Haltbarkeitserhöhend wirkt es sich· aus, wenn ein gewisser Prozentsatz des Erdalkali, jedoch nicht über 5%, durch Berrylliumoxyd ersetzt wird. In gleicher Weise wirkt sich ein Zusatz von Al2O3 aus, der jedoch ebenfalls unter 5% liegen muß. Für die chemische Haltbarkeit J1St es weiter günstig, wenn der ThO2-Gehalt nicht unter 4% absinkt. .Further stability against crystallization is achieved if the silica content remains below 6%. It increases the shelf life if a certain percentage of the alkaline earth, but not more than 5%, is replaced by beryllium oxide. The addition of Al 2 O 3 has the same effect, but this must also be below 5%. For the chemical durability J 1 St is further advantageous if the ThO does not decrease 2 content below 4%. .
Zur Vermeidung eines leichten Gelbstiches, der besonders bei sehr hochbrechenden Gläsern auftritt, wenn dessen Rohstoffe nicht extrem rein sind, ist ein Zusatz von Phosphoroxyd bis zu 3% günstig.To avoid a slight yellow tinge, which occurs especially with very high refractive index glasses, if its raw materials are not extremely pure, phosphorus oxide can be added up to 3% cheap.
Es liegt im Rahmen der Erfindung, wenn weitere, in der Glasschmelztechnik übliche Bestandteile wie Alkali, Tantaloxyd, Nioboxyd, Wolframoxyd, Cadmiumoxyd, Antimonoxyd, Titanoxyd, Wismutoxyd zugesetzt werden, sofern die Mengen insgesamt unter 5% bleiben. Es ist an sich durchaus möglich, auch Gläser mit größeren Mengen an CdO zu erschmelzen; jedoch sind diese Gläser wegen der Giftigkeit des Cd weniger von Interesse.It is within the scope of the invention if other components that are customary in glass melting technology, such as Alkali, tantalum oxide, niobium oxide, tungsten oxide, cadmium oxide, antimony oxide, titanium oxide, bismuth oxide can be added, provided that the total amounts remain below 5%. In itself it is quite possible to melt glasses with larger amounts of CdO; however, these glasses are less of concern because of the toxicity of the cd.
In der Tafel Fig. 1 sind beispielsweise achtzehn Glaszusammensetzungen gemäß der Erfindung aufgeführt. In the table of FIG. 1, for example, eighteen glass compositions according to the invention are listed.
In der Fig. 2 ist ein Diagramm wiedergegeben, welches in üblicher Weise die Funktion der Brechungszahl nd zur Abbeschen Zahl vd zeigt, go In diesem Diagramm wurden die optischen Werte der Glaszusammensetzungen 1 bis 18 der Tafel eingetragen. Die beiden schrägen Geraden des Diagramms entsprechen den Bedingungen, die eingangs für nd und ν angegeben wurden. Unter diesen Gläsern sind die Zusammensetzungen 5 und 14 wegen ihrer großen Stabilität bei mäßigem Preis besonders wertvoll.In FIG. 2, a diagram is reproduced which, in the usual way, shows the function of the refractive index n d for Abbe's number v d , go The optical values of the glass compositions 1 to 18 of the table were entered in this diagram. The two inclined straight lines in the diagram correspond to the conditions that were specified for n d and ν at the beginning. Among these glasses, compositions 5 and 14 are particularly valuable because of their great stability at a moderate price.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEJ8259A DE958150C (en) | 1954-02-10 | 1954-02-11 | Optical glass |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE783110X | 1954-02-10 | ||
| DEJ8259A DE958150C (en) | 1954-02-10 | 1954-02-11 | Optical glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE958150C true DE958150C (en) | 1957-02-14 |
Family
ID=25948281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEJ8259A Expired DE958150C (en) | 1954-02-10 | 1954-02-11 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE958150C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958999A (en) * | 1971-07-30 | 1976-05-25 | Hoya Glass Works, Ltd. | Optical glass |
| DE2820940A1 (en) | 1977-05-19 | 1978-11-23 | Ohara Optical Glass Mfg | OPTICAL GLASS |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR922474A (en) * | 1943-05-31 | 1947-06-10 | Chance Brothers Ltd | Improvements to optical glasses |
| FR922475A (en) * | 1943-11-11 | 1947-06-10 | Chance Brothers Ltd | Advanced optical glasses |
| US2584975A (en) * | 1951-03-27 | 1952-02-12 | Corning Glass Works | Optical glass |
| DE845247C (en) * | 1948-02-04 | 1952-07-31 | British Thomson Houston Co Ltd | Glasses, in particular intermediate glasses |
-
1954
- 1954-02-11 DE DEJ8259A patent/DE958150C/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR922474A (en) * | 1943-05-31 | 1947-06-10 | Chance Brothers Ltd | Improvements to optical glasses |
| FR922475A (en) * | 1943-11-11 | 1947-06-10 | Chance Brothers Ltd | Advanced optical glasses |
| DE845247C (en) * | 1948-02-04 | 1952-07-31 | British Thomson Houston Co Ltd | Glasses, in particular intermediate glasses |
| US2584975A (en) * | 1951-03-27 | 1952-02-12 | Corning Glass Works | Optical glass |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958999A (en) * | 1971-07-30 | 1976-05-25 | Hoya Glass Works, Ltd. | Optical glass |
| DE2820940A1 (en) | 1977-05-19 | 1978-11-23 | Ohara Optical Glass Mfg | OPTICAL GLASS |
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