US4120732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Ohara Inc
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Filing: 1977-12-12
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Granted: 1978-10-17
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Expires: 1997-12-12
Abstract
Abstract An optical glass consisting essentially of a B 2 O 3 --La 2 O 3 --Gd 2 O 3 --WO 3 --ZrO 2 and/or Ta 2 O 5 system has high refractive and low dispersive characteristics with optical constants of 1.85-1.96 for Nd and 43-28 for νd, is free of poisonous ThO 2 , CdO and BeO ingredients, and suitable for mass production.
Inventors
- 👤 Fujio Komorita
- 👤 Muneo Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:47
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/12; C03C3/14; C03C3/15; C03C3/155; C03C3/23; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
216 words
An optical glass consisting of a composition in weight percent of 10 to less than 17% B 2 O 3 , 20 to 55% La 2 O 3 , 0.5 to 38% Gd 2 O 3 , 0.5 to 32% WO 3 , 0 to 10% ZrO 2 , 0 to 30% Ta 2 O 5 , the total of said ZrO 2 and Ta 2 O 5 being 2 to 35%, 0 to 5.5% SiO 2 , 0 to 5% GeO 2 , 0 to 16% Y 2 O 3 , 0 to 5% Tb 4 O 7 , 0 to 38% Yb 2 O 3 , the total of said Y 2 O 3 , Tb 4 O 7 , and Yb 2 O 3 being 0 to 40%, 0 to less than 2% TiO 2 , 0 to 31% Nb 2 O.sub. 5, 0 to 3% SnO 2 , 0 to 5% Al 2 O 3 , 0 to 5% In 2 O 3 , 0 to 5% Bi 2 O 3 , and an oxide or oxides selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and PbO, the amount of or the total amount of said MgO, CaO, SrO, BaO, ZnO and PbO being 0 to less than 2%.
Claim 2
Dependent Claim
216 words
An optical glass consisting of a composition in weight percent of 10 to less than 17% B 2 O 3 , 20 to 55% La 2 O 3 , 0.5 to 38% Gd 2 O 3 , 0.5 to 32% WO 3 , 0 to 10% ZrO 2 , 0 to 30% Ta 2 O 5 , the total of said ZrO 2 and Ta 2 O 5 being 2 to 35%, 0 to 5.5% SiO 2 , 0 to 5% GeO 2 , 0 to 16% Y 2 O 3 , 0 to 5% Tb 4 O 7 , 0 to 38% Yb 2 O 3 , the total of said Y 2 O 3 , Tb 4 O 7 , and Yb 2 O 3 being 0 to 40%, 0 to less than 2% TiO 2 , 0 to 31% Nb 2 O.sub. 5, 0 to 3% SnO 2 , 0 to 5% Al 2 O 3 , 0 to 5% In 2 O 3 , 0 to 5% Bi 2 O 3 , and an oxide or oxides selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and PbO, the amount of or the total amount of said MgO, CaO, SrO, BaO, ZnO and PbO being 0 to less than 2%.
Claim 3
Dependent Claim
63 words
The optical glass according to claim 1 which includes a fluoride or fluorides in substitution, in part or in whole, for the oxide or oxides of the same element or elements as said fluoride or fluorides among the ingredients of said composition, the total amount of fluorine contained in said fluoride or fluorides being in a proportion of up to 2% by weight.
References Cited (Backward Citations)
US3958999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |