US3365762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pipe gripping structure
Assignee: CAVINS CO
•
Filing: 1965-08-02
•
Granted: 1968-01-30
•
Expires: 1985-08-02
Abstract
No abstract record available.
Inventors
- 👤 Willy H Spiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1562469A
Cited
GB243625A
Cited
US1758108A
Cited
US2048209A
Cited
US2231923A
Cited
US2061772A
Cited
US2290799A
Cited
US2589159A
Cited
US2786229A
Cited
US2939197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |