Patent US2990535A successfully refreshed from Google Patents.
US2990535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seismic equipment
Assignee: Clevite Corp
•
Filing: 1956-11-26
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Granted: 1961-06-27
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Expires: 1976-11-26
Abstract
No abstract record available.
Inventors
- 👤 David B Parkinson
- 👤 Webster C Roberts
- 👤 Haner Lambert
- 👤 Lepley Allen Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:17
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/362; G01V2210/00; G01V2210/50; G01V2210/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732025A
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US2243730A
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US2429236A
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US2440971A
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US2604955A
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US2620890A
Cited
US2800639A
Cited
US2803515A
Cited
US2825885A
Cited
US2802201A
Cited
US2876428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |