US3795523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide containing variable-transmittance borosilicate glass
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1972-07-05
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Granted: 1974-03-05
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Expires: 1992-07-05
Abstract
Abstract A VARIABLE-TRANSMITTANCE GLASS, HAVING A HIGH RESPONSE SPEED TO LIGHT, CONSISTING ESSENTIALLY OF 50-70% OF SI02, 10-26% OF B2O3, 6-14% OF AL2O3 AND 5-15% OF ALKALI METAL OXIDES INCLUDING K2O AND LI2O IN A RATIO OF FROM 1:0.1 TO 1:0.7, WITH THE CONTENT OF OTHER ALKALI METAL OXIDES KEPT BELOW THE LI2O CONTENT, ALL OF WHICH MAKE A TOTAL OF 100%, PLUS 0.05-1.0% OF AG, AT LEAST AN EQUIVALENT PERCENTAGE OF AT LEAST ONE HALOGEN TO THE PERCENTAGE OF AG TO FORM SILVER HALIDE CRYSTALS, AND 0.005-0.03% OF CUO, ALL PERCENTAGES BEING BY WEIGHT.
Inventors
- 👤 Y Moriya
- 👤 T Ueno
- 👤 T Kawamoto
- 👤 H Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |