US2657576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforation production tester
Assignee: Individual
•
Filing: 1947-03-03
•
Granted: 1953-11-03
•
Expires: 1967-03-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert O Boykin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:30
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1606104A
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US1893162A
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US1889889A
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US2143962A
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US2158569A
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US2187047A
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US2262655A
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US2313369A
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US2441894A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |