US3703388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High refractive index photochromic glasses
Assignee: Corning Glass Works
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Filing: 1970-08-19
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Granted: 1972-11-21
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Expires: 1990-08-19
Abstract
Abstract THIS INVENTION RELATES TO A FAMILY OF HIGH REFRACTIVE INDEX PHOTOCHROMIC GLASSES COMPRISED OF LANTHANUM-BORATES CONTAINING SILVER HALIDES AND EXHIBITING INCREASED PHOTOCHROMIC DARKENABILITY AND EFFICIENT OPTICAL BLEACHING.
Inventors
- 👤 Roger J Araujo
- 👤 Loris G Sawchuk
- 👤 Thomas P Seward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:36
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |