Patent EP0278038A1 successfully refreshed from Google Patents.
US2901685A
Expired / Lapsed
US
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Apparatus for earth borehole investigating and signaling
Assignee: Dresser Industries Inc
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Filing: 1954-10-18
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Granted: 1959-08-25
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Expires: 1974-10-18
Abstract
No abstract record available.
Inventors
- 👤 Alder Robert Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:50
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/52; G01V3/00; G01V3/18; G01V3/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2225668A
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US2547875A
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US2354887A
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US2524031A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |