US4168176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass for Faraday rotation elements
Assignee: Hoya Corp
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Filing: 1978-03-24
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Granted: 1979-09-18
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Expires: 1998-03-24
Abstract
Abstract A stable glass for a Faraday rotation element, the glass comprising, in mole%, 15 to 18% Ce 2 O 3 , 64 to 76% P 2 O 5 , 4 to 16% B 2 O 3 , 0 to 8% SiO 2 , and 0 to 10% Al 2 O 3 with 2 to 12% SiO 2 +Al 2 O 3 .
Inventors
- 👤 Shinichiro Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/04; C03C3/062; C03C3/064; C03C3/19; C03C4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A glass for a Faraday rotation element having a high Verdet constant, said glass consisting essentially of, in mole%, 15 to 18% Ce 2 O 3 , 64 to 76% P 2 O 5 , 4 to 16% B 2 O 3 , 0 to 8% SiO 2 , and 0 to 10% Al 2 O 3 with 2 to 12% SiO 2 +Al 2 O 3 .
Claim 2
Dependent Claim
68 words
A glass for a Faraday rotation element having a high Verdet constant, said glass consisting essentially of, in mole%, 15 to 18% Ce 2 O 3 , 64 to 76% P 2 O 5 , 4 to 16% B 2 O 3 , 0 to 8% SiO 2 , and 0 to 10% Al 2 O 3 with 2 to 12% SiO 2 +Al 2 O 3 .
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |