Patent US2970650A successfully refreshed from Google Patents.
US2970650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baker
Assignee: —
•
Filing: —
•
Granted: 1961-02-07
•
Expires: 1978-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:30
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06; E21B23/001; E21B23/004; E21B23/006; E21B23/01; E21B23/04; E21B23/14; E21B4/00; E21B4/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2589506A
Cited
US2802533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |