Patent US2580828A successfully refreshed from Google Patents.
US2580828A
Expired / Lapsed
US
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Pipe holding slip
Assignee: Individual
•
Filing: 1947-04-09
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Granted: 1952-01-01
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Expires: 1967-04-09
Abstract
No abstract record available.
Inventors
- 👤 William L Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:45
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3916; Y10T24/3929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1486035A
Cited
US1356458A
Cited
US1966454A
Cited
US1999519A
Cited
US2208926A
Cited
US2269888A
Cited
US2496172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |