US2986442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic oscillograph for observing slow recurrent signals
Assignee: Century Geophysical Corp
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Filing: 1956-07-19
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Granted: 1961-05-30
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Expires: 1976-07-19
Abstract
No abstract record available.
Inventors
- 👤 Robert A Broding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G01; G01R; G01R13/00; G01R13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143214A
Cited
US2551582A
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US2624652A
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US2692178A
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US2777745A
Cited
US2756676A
Cited
US2895847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |