US2808759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projectors
Assignee: American Optical Corp
•
Filing: 1953-10-12
•
Granted: 1957-10-08
•
Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 John F Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:20
CPC Classifications
G; G03; G03B; G03B23/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US952199A
Cited
FR435599A
Cited
US2231743A
Cited
US2298413A
Cited
US2298369A
Cited
US2468565A
Cited
US2477107A
Cited
US2522760A
Cited
US2614458A
Cited
US2590492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |