Patent US2455942A successfully refreshed from Google Patents.
US2455942A
Expired / Lapsed
US
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Geophysical exploration of boreholes by microwaves
Assignee: Gulf Research and Development Co
•
Filing: 1944-12-13
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Granted: 1948-12-14
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Expires: 1964-12-13
Abstract
No abstract record available.
Inventors
- 👤 Norman D Coggeshall
- 👤 Muskat Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2075808A
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US2129711A
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US2129712A
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US2167630A
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US2139460A
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US2253589A
Cited
US2334475A
Cited
US2343531A
Cited
US2346481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |