Patent US2755706A successfully refreshed from Google Patents.
US2755706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opthalmic lenses and method of making same
Assignee: American Optical Corp
•
Filing: 1952-04-18
•
Granted: 1956-07-24
•
Expires: 1972-04-18
Abstract
No abstract record available.
Inventors
- 👤 Cole Thomas Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:50
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1866734A
Cited
US2033573A
Cited
US2035846A
Cited
US2053551A
Cited
US2071616A
Cited
US2173651A
Cited
US2177022A
Cited
US2274143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |