Patent US1603140A successfully refreshed from Google Patents.
Patent US4411492A successfully refreshed from Google Patents.
Patent US4864499A successfully refreshed from Google Patents.
Patent US3030165A successfully refreshed from Google Patents.
Patent US1933915A successfully refreshed from Google Patents.
Patent US3516496A successfully refreshed from Google Patents.
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
•
Granted: 1970-06-23
•
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
2026-11-02 16:10
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |