Patent US4944741A successfully refreshed from Google Patents.
Patent US2554844A successfully refreshed from Google Patents.
US2554844A
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Assignee: Well Surveys Inc
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Filing: 1946-03-22
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Granted: 1951-05-29
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Expires: 1966-03-22
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |