US3516496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well completion and workover fluid and method of use thereof
Assignee: Shell USA Inc
•
Filing: 1968-07-29
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Granted: 1970-06-23
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Expires: 1988-07-29
Abstract
No abstract record available.
Inventors
- 👤 James H Barkman Jr
- 👤 Henry C H Darley
- 👤 Robert M Jorda
- 👤 Robert N Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; C09K8/56; C09K8/57; C09K8/575; C09K8/5751; C09K8/5755
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |