US2961481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secrecy television
Assignee: Individual
•
Filing: 1954-12-30
•
Granted: 1960-11-22
•
Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
- 👤 Ellison S Purington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:51
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AU1578934A
Cited
US2406350A
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US2472774A
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US2510046A
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US2547598A
Cited
US2656407A
Cited
US2757226A
Cited
FR1034776A
Cited
US2823252A
Cited
US2697741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |