Patent EP0193091A2 successfully refreshed from Google Patents.
Patent US2109474A successfully refreshed from Google Patents.
US2109474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectacle lens
Assignee: Individual
•
Filing: 1931-12-07
•
Granted: 1938-03-01
•
Expires: 1951-12-07
Abstract
No abstract record available.
Inventors
- 👤 Evans Charles Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:42
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; G02C7/061; G02C7/063; G02C7/065
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1941-02-28 | 1941-08-30 | 1942-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-28 | 1945-08-30 | 1946-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-28 | 1949-08-30 | 1950-03-01 | $7700.00 | Window Closed / Lapsed |