US2587518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical logging method and apparatus
Assignee: Sunoco Inc
•
Filing: 1949-01-21
•
Granted: 1952-02-26
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Expires: 1969-01-21
Abstract
No abstract record available.
Inventors
- 👤 John M Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:17
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1826961A
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US2397254A
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US2397255A
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US2297754A
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US2414194A
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US2317259A
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US2459196A
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US2371658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |