Patent US3377549A successfully refreshed from Google Patents.
US3377549A
Expired / Lapsed
US
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Coil assembly structure and mounting forming an annular chamber to be mounted and sealed on a drill collar
Assignee: ARPS CORP
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Filing: 1964-12-23
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Granted: 1968-04-09
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 James L Newman
- 👤 William F Osborn
- 👤 Fletcher H Redwine
- 👤 Paul J Arnerich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:55
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28; E; E21; E21B; E21B17/00; E21B17/003; E21B47/00; E21B47/01; E21B47/017
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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |