US4111707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Ohara Inc
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Filing: 1977-12-14
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Granted: 1978-09-05
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Expires: 1997-12-14
Abstract
Abstract An optical glass consisting essentially of a B 2 O 3 -SiO 2 -La 2 O 3 -Gd 2 O 3 -Y 2 O 3 system and additionally containing ZrO 2 has high refractive and low dispersive characteristics and is free of a poisonous thorium oxide ingredient.
Inventors
- 👤 Fujio Komorita
- 👤 Nobuhiro Nozawa
- 👤 Satoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:00
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
170 words
An optical glass substantially consisting of a composition in weight percent of 26 to 38% B 2 O 3 , 0.5 to 7% SiO 2 , 31 to 38% La 2 O 3 , 17 to 30% Gd 2 O 3 , 1 to 7% Y 2 O 3 , the total of said La 2 O 3 , Gd 2 O 3 and Y 2 O 3 being 58 to 64%, 0 to 8% ZrO 2 , 0 to 2% SnO 2 , 0 to 2% GeO 2 , an oxide or oxides selected from the group consisting of Li 2 O, Na 2 O and K 2 O, the total of said Li 2 O, Na 2 O and K 2 O being 0 to 0.5%, and an oxide or oxides selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and Al 2 O 3 , the total of said MgO, CaO, SrO, BaO, ZnO and Al 2 O 3 being 0 to less than 2%.
Claim 2
Dependent Claim
170 words
An optical glass substantially consisting of a composition in weight percent of 26 to 38% B 2 O 3 , 0.5 to 7% SiO 2 , 31 to 38% La 2 O 3 , 17 to 30% Gd 2 O 3 , 1 to 7% Y 2 O 3 , the total of said La 2 O 3 , Gd 2 O 3 and Y 2 O 3 being 58 to 64%, 0 to 8% ZrO 2 , 0 to 2% SnO 2 , 0 to 2% GeO 2 , an oxide or oxides selected from the group consisting of Li 2 O, Na 2 O and K 2 O, the total of said Li 2 O, Na 2 O and K 2 O being 0 to 0.5%, and an oxide or oxides selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and Al 2 O 3 , the total of said MgO, CaO, SrO, BaO, ZnO and Al 2 O 3 being 0 to less than 2%.
Claim 3
Dependent Claim
72 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 5% by weight in terms of the amount of F 2 .
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |