US2877080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-intensity recorder
Assignee: Pan American Petroleum Corp
•
Filing: 1956-07-02
•
Granted: 1959-03-10
•
Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Eisler
- 👤 Charles F Hadley
- 👤 Silverman Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:47
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2682575A
Cited
US2539553A
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US2664509A
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US2680151A
Cited
GB710411A
Cited
GB688235A
Cited
US2739865A
Cited
US2708615A
Cited
US2775503A
Cited
US2789027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |