Patent US2929611A successfully refreshed from Google Patents.
US2929611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
John albert read
Assignee: —
•
Filing: 1955-01-25
•
Granted: 1960-03-22
•
Expires: 1975-01-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US13646A
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US540764A
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US1286161A
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US2296816A
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US2261180A
Cited
US2191348A
Cited
US2289465A
Cited
US2321475A
Cited
US2340572A
Cited
US2598112A
Cited
US2692756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |