Patent US4936639A successfully refreshed from Google Patents.
US2883902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prompting apparatus
Assignee: Individual
•
Filing: 1954-10-14
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Granted: 1959-04-28
•
Expires: 1974-10-14
Abstract
No abstract record available.
Inventors
- 👤 Oppenheimer Jess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:32
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/2222
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1636834A
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US1372675A
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US1935572A
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US1985253A
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US2279084A
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US2291931A
Cited
US2420198A
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US2484379A
Cited
US2598947A
Cited
US2696753A
Cited
US2711667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |