Patent US2879468A successfully refreshed from Google Patents.
US2879468A
Expired / Lapsed
US
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Earth borehole investigation system
Assignee: Dresser Industries Inc
•
Filing: 1954-02-08
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Granted: 1959-03-24
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Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Jefferson P Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2132807A
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US2376168A
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US2357177A
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US2347794A
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US2592101A
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US2501953A
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US2596125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |