US3465820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retainer packers having a rotating valve
Assignee: Schlumberger Technology Corp
•
Filing: 1967-10-05
•
Granted: 1969-09-09
•
Expires: 1987-10-05
Abstract
No abstract record available.
Inventors
- 👤 James W Kisling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/004; E21B23/006; E21B34/00; E21B34/06; E21B34/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2785755A
Cited
US3306366A
Cited
US3334691A
Cited
US3332495A
Cited
US3351133A
Cited
US3347318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |