US3472325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drilling with polymer-treated drilling fluid
Assignee: Pan American Petroleum Corp
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Filing: 1968-12-23
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Granted: 1969-10-14
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Expires: 1988-12-23
Abstract
No abstract record available.
Inventors
- 👤 James L Lummus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2755557A
Cited
US3025236A
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US3070543A
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US3081260A
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US3072569A
Cited
US3323603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |