US2804574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical system
Assignee: AT&T Inc
•
Filing: 1943-07-17
•
Granted: 1957-08-27
•
Expires: 1963-07-17
Abstract
No abstract record available.
Inventors
- 👤 Edwin F Kingsbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1313187A
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US1680348A
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US1650092A
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US1889758A
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US1864670A
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US1832707A
Cited
US2145021A
Cited
GB474421A
Cited
US2219189A
Cited
US2360233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |