US2962649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant d. c. voltage circuit
Assignee: PHOTO RES CORP
•
Filing: 1954-09-20
•
Granted: 1960-11-29
•
Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 William A Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1357223A
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US1835121A
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US1967303A
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US2201979A
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US2299942A
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US2413033A
Cited
US2431994A
Cited
US2474255A
Cited
US2458516A
Cited
US2763828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |