Patent US2261915A successfully refreshed from Google Patents.
US2837087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for use in treating visual defects
Assignee: American Optical Corp
•
Filing: 1952-05-24
•
Granted: 1958-06-03
•
Expires: 1972-05-24
Abstract
No abstract record available.
Inventors
- 👤 Allen Priscilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/022; A61H; A61H5/00; G; G02; G02C; G02C7/00; G02C7/10; G02C7/104; G02C7/105
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2280297A
Cited
US2233689A
Cited
US2238207A
Cited
GB552582A
Cited
US2618259A
Cited
US2676588A
Cited
US2670654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |