Patent US2395561A successfully refreshed from Google Patents.
US2395561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection apparatus
Assignee: American Optical Corp
•
Filing: 1942-10-05
•
Granted: 1946-02-26
•
Expires: 1962-10-05
Abstract
No abstract record available.
Inventors
- 👤 Osterberg Harold
- 👤 Paul C Heijn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:40
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/16
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) | 1949-02-25 | 1949-08-27 | 1950-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-25 | 1953-08-27 | 1954-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-25 | 1957-08-27 | 1958-02-26 | $7700.00 | Window Closed / Lapsed |