US3062293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage oil well casing cementing with upper and lower stationary slots for secondary stage
Assignee: Individual
•
Filing: 1959-12-15
•
Granted: 1962-11-06
•
Expires: 1979-12-15
Abstract
No abstract record available.
Inventors
- 👤 Richard L Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:50
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1629018A
Cited
US2196652A
Cited
US2119349A
Cited
US2191750A
Cited
US2811206A
Cited
US2811208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |