US3068946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knuckle joint
Assignee: Eastman Oil Well Survey Co
•
Filing: 1958-12-15
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Granted: 1962-12-18
•
Expires: 1978-12-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Frisby
- 👤 Winfield H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:39
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06
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) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |