US3496902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing lost circulation during earth borehole drilling
Assignee: Atlantic Richfield Co
•
Filing: 1968-04-24
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Granted: 1970-02-24
•
Expires: 1988-04-24
Abstract
No abstract record available.
Inventors
- 👤 James M Cleary
- 👤 Loyd R Kern
- 👤 Thomas K Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:19
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2626779A
Cited
US2912380A
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US2873250A
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US2779417A
Cited
US2943679A
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US2943680A
Cited
US3042608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |