US4194916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversibly photosensitive glass
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1979-03-09
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Granted: 1980-03-25
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Expires: 1999-03-09
Abstract
Abstract A reversibly photosensitive glass consisting of cadmium oxide, germanium dioxide, sodium oxide and thallous oxide. A reversibly photosensitive glass consisting of silicon dioxide, sodium oxide, cadmium oxide and thallous oxide.
Inventors
- 👤 Ken Kumata
- 👤 Hiroshi Namikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:16
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/12; C03C3/253; C03C4/00; C03C4/04; C03C4/06; C03C4/065; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A reversibly photosensitive glass, consisting of a composition having CdO, GeO 2 and Na 2 O in the proportions falling within the area enclosed with straight lines connecting Point J (32 mol% of CdO, 51 mol% of GeO 2 and 17 mol% of Na 2 O), Point K (9 mol% of CdO, 51 mol% of GeO 2 and 40 mol% of Na 2 O), Point L (0 mol% of CdO, 60 mol% of GeO 2 and 40 mol% of Na 2 O), Point M (0 mol% of CdO, 85 mol% of GeO 2 and 15 mol% of Na 2 O), Point N (5 mol% of CdO, 85 mol% of GeO 2 and 10 mol% of Na 2 O) and Point P (32 mol% of CdO, 58 mol% of GeO 2 and 10 mol% of Na 2 0), plus 0.1 to 3 mol%, based on the combined amount of the abovementioned components, of Tl 2 O.
Claim 2
Dependent Claim
155 words
A reversibly photosensitive glass, consisting of a composition having CdO, GeO 2 and Na 2 O in the proportions falling within the area enclosed with straight lines connecting Point J (32 mol% of CdO, 51 mol% of GeO 2 and 17 mol% of Na 2 O), Point K (9 mol% of CdO, 51 mol% of GeO 2 and 40 mol% of Na 2 O), Point L (0 mol% of CdO, 60 mol% of GeO 2 and 40 mol% of Na 2 O), Point M (0 mol% of CdO, 85 mol% of GeO 2 and 15 mol% of Na 2 O), Point N (5 mol% of CdO, 85 mol% of GeO 2 and 10 mol% of Na 2 O) and Point P (32 mol% of CdO, 58 mol% of GeO 2 and 10 mol% of Na 2 0), plus 0.1 to 3 mol%, based on the combined amount of the abovementioned components, of Tl 2 O.
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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |