US3486808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gradient refractive index optical lenses
Assignee: Bausch and Lomb Inc
•
Filing: 1966-03-14
•
Granted: 1969-12-30
•
Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 David P Hamblen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:44
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0087; C; C03; C03C; C03C21/00; C03C21/001; C03C21/005; G02C; G02C2202/00; G02C2202/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1509636A
Cited
US2290911A
Cited
US2344250A
Cited
US2547416A
Cited
US2511517A
Cited
US3212401A
Cited
DE1191980B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |