US4080216A
Expired / Lapsed
US
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Optical glass
Assignee: Nikon Corp
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Filing: 1976-07-01
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Granted: 1978-03-21
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Expires: 1996-07-01
Abstract
Abstract An optical glass having a refractive index (nd) in the range of 1.71 to 1.74 and Abbe number (v) in the range of from 49 to 54, the glass consisting essentially of, by weight, 1 to 5% SiO2, 30 to 41% B2O3, 2 to 6% Al2O3, 42 to 50% La2O3, 3 to 7% ZrO2, and 1 to 12% Ta2O5.
Inventors
- 👤 Kazufumi Ishibashi
- 👤 Takeo Ichimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:51
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: 4
Claim 1
Independent Claim
102 words
An optical glass composition devoid of a divalent metal oxide having a refractive index of from 1.71 to 1.74 and Abbe number of from 49 to 54 which consists essentially of, by weight: SiO 2 . . . . . 1 to 5%, B 2 o 3 . . . . . 30 to 41%, Al 2 O 3 . . . . . 2 to 6%, La 2 O 3 . . . . . 42 to 50%, ZrO 2 . . . . . 3 to 7% and Ta 2 O 5 . . . . . 1 to 12%.
Claim 2
Dependent Claim
102 words
An optical glass composition devoid of a divalent metal oxide having a refractive index of from 1.71 to 1.74 and Abbe number of from 49 to 54 which consists essentially of, by weight: SiO 2 . . . . . 1 to 5%, B 2 o 3 . . . . . 30 to 41%, Al 2 O 3 . . . . . 2 to 6%, La 2 O 3 . . . . . 42 to 50%, ZrO 2 . . . . . 3 to 7% and Ta 2 O 5 . . . . . 1 to 12%.
Claim 3
Dependent Claim
90 words
An optical glass composition as set forth in claim 1, wherein the ingredients are present in the following amounts, by weight: SiO 2 . . . . . 2 to 4, B 2 o 3 . . . . . 31 to 35, Al 2 O 3 . . . . . 3 to 5, La 2 O 3 . . . . . 45 to 49, ZrO 2 . . . . . 4 to 6 and Ta 2 O 5 . . . . . 7 to 11.
Claim 4
Dependent Claim
79 words
An optical glass composition as set forth in claim 2, wherein the ingredients are present in the following approximate amounts, by weight: SiO 2 . . . . . 2, B 2 o 3 . . . . . 33, al 2 O 3 . . . . . 4, La 2 O 3 . . . . . 47, ZrO 2 . . . . . 5 and Ta 2 O 5 . . . . . 9.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |