US3602323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permafrost drilling method
Assignee: Atlantic Richfield Co
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Filing: 1969-12-22
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Granted: 1971-08-31
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Expires: 1989-12-22
Abstract
Abstract A pad for drilling at least one borehole through the earth, the pad being composed of a first layer of particulate material adjacent the earth, a second layer composed of spaced-apart members to form a plurality of channels therein, and a third layer composed of support material. A method for drilling a borehole through tundra and permafrost without substantially thawing same by using the above described pad for carrying out the drilling procedure.
Inventors
- 👤 Frank J Schuh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/008; Y; Y10; Y10S; Y10S166/00; Y10S166/901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
39 words
A method according to claim 1 wherein there is a fourth layer between said first and second layers, said fourth layer being composed of support material, and the drilling steps are carried out while operating from said third layer.
Claim 2
Dependent Claim
28 words
A method according to claim 2 wherein said first layer is composed substantially of gravel, and said second, third, and fourth layers are composed substantially of wooden members.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein said first layer is composed substantially of gravel and said second and third layers are composed suBstantially of wooden members.
References Cited (Backward Citations)
US2939290A
Cited
US3244242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |