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US3609980A
Expired / Lapsed
US
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Method and apparatus for installing supporting elements in permafrost
Assignee: Phillips Petroleum Co
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Filing: 1969-12-29
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Granted: 1971-10-05
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Expires: 1989-12-29
Abstract
Abstract A METHOD AND APPARATUS FOR THAWING PERMAFROST AND INSTALLING AN ELONGATED SUPPORTING ELEMENT THEREIN.
Inventors
- 👤 John R Bowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:38
CPC Classifications
E; E02; E02D; E02D7/00; Y; Y10; Y10S; Y10S166/00; Y10S166/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |