US3434781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmic lens series
Assignee: American Optical Corp
•
Filing: 1965-03-15
•
Granted: 1969-03-25
•
Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 John K Davis
- 👤 Henry G Fernald
- 👤 Arline W Rayner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:39
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1315667A
Cited
US1588559A
Cited
US1715784A
Cited
US2180887A
Cited
US2391045A
Cited
US2543949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |