US2749801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective optical projection systems
Assignee: American Optical Corp
•
Filing: 1951-11-09
•
Granted: 1956-06-12
•
Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 Clotar Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:39
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888; G02B17/0804; G02B17/0808
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2324133A
Cited
US1650591A
Cited
US1699108A
Cited
US1943511A
Cited
US2295779A
Cited
US2476124A
Cited
US2309788A
Cited
GB544694A
Cited
US2492461A
Cited
US2449345A
Cited
US2482566A
Cited
US2504383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |