US2764058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable combined photographic slide viewing and projecting device
Assignee: American Optical Corp
•
Filing: 1952-11-01
•
Granted: 1956-09-25
•
Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Charles A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US778891A
Cited
GB191468A
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US1992776A
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US2126415A
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US2152424A
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US2366554A
Cited
US2357542A
Cited
US2478336A
Cited
US2543113A
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US2445651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |