US3495665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well servicing methods utilizing a foamed hydrophobic liquid
Assignee: Mobil Oil AS
•
Filing: 1967-09-15
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Granted: 1970-02-17
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Expires: 1987-09-15
Abstract
No abstract record available.
Inventors
- 👤 John Kelly Jr
- 👤 Elmo M Blount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2773670A
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US2818231A
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US3065791A
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US3141503A
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US3155178A
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US3240280A
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US3323593A
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US3394758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |