Patent US4439530A successfully refreshed from Google Patents.
US4439530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Hoya Corp
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Filing: 1983-01-20
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Granted: 1984-03-27
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Expires: 2003-01-20
Abstract
Abstract An optical glass comprising, in % by weight, 18 to 38% P2O5; 3 to 30% Na2O+K2O, with the proviso of 0 to 30% Na2O and 0 to 30% K2O; 8 to 65% PbO; 1 to 45% Ta2O5; 0 to 20% Nb2O5; 0 to 15% TiO2+WO3; 0 to 25% BaO+CaO+ZnO+SrO+MgO, with the proviso of 0 to 25% BaO, 0 to 5% CaO, 0 to 25% ZnO, 0 to 20% SrO, and 0 to 10% MgO; 0 to 15% B2O3; 0 to 3% Li2O; 0 to 3% Al2O3; 0 to 3% ZrO2; 0 to 3% Y2O3; 0 to 3% Gd2O3; and 0 to 3% La2O3.
Inventors
- 👤 Hidemi Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; C03C3/17; C03C3/21; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
An optical glass consisting essentially of, in % by weight, 18 to 38% P 2 O 5 ; 3 to 30% Na 2 O+K 2 O, with the proviso of 0 to 30% Na 2 O and 0 to 30% K 2 O; 15 to 65% PbO; 1 to 45% Ta 2 O 5 ; 0 to 20% Nb 2 O 5 ; 0 to 15% TiO 2 +WO 3 ; 0 to 25% BaO+CaO+ZnO+SrO+MgO, with the proviso of 0 to 25% BaO, 0 to 5% CaO, 0to 25% ZnO, 0 to 20% SrO, 0 to 10% MgO, and 0 to 32% K 2 O+BaO; 0 to 15% B 2 O 3 ; 0 to 3% Li 2 O; 0 to 3% Al 2 O 3 ; 0 to 3% ZrO 2 ; 0 to 3% Y 2 O 3 ; 0 to 3% Gd 2 O 3 ; and 0 to 3% La 2 O 3 .
Claim 2
Dependent Claim
158 words
An optical glass consisting essentially of, in % by weight, 18 to 38% P 2 O 5 ; 3 to 30% Na 2 O+K 2 O, with the proviso of 0 to 30% Na 2 O and 0 to 30% K 2 O; 15 to 65% PbO; 1 to 45% Ta 2 O 5 ; 0 to 20% Nb 2 O 5 ; 0 to 15% TiO 2 +WO 3 ; 0 to 25% BaO+CaO+ZnO+SrO+MgO, with the proviso of 0 to 25% BaO, 0 to 5% CaO, 0to 25% ZnO, 0 to 20% SrO, 0 to 10% MgO, and 0 to 32% K 2 O+BaO; 0 to 15% B 2 O 3 ; 0 to 3% Li 2 O; 0 to 3% Al 2 O 3 ; 0 to 3% ZrO 2 ; 0 to 3% Y 2 O 3 ; 0 to 3% Gd 2 O 3 ; and 0 to 3% La 2 O 3 .
References Cited (Backward Citations)
US4108673A
Cited
US4193807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |