Patent US2991693A successfully refreshed from Google Patents.
US2991693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front projection screen
Assignee: American Optical Corp
•
Filing: 1956-07-23
•
Granted: 1961-07-11
•
Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Stephen M Macneille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/602
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2351034A
Cited
US1849036A
Cited
US1882829A
Cited
US2210806A
Cited
US2381614A
Cited
US2338654A
Cited
US2358070A
Cited
US2618198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |