US2582944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable bit
Assignee: Individual
•
Filing: 1947-05-20
•
Granted: 1952-01-22
•
Expires: 1967-05-20
Abstract
No abstract record available.
Inventors
- 👤 Berscheid Irvine Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:31
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US51065A
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US63681A
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US1277970A
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US1571348A
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US2191492A
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US2168102A
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US2191699A
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US2203216A
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US2358052A
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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) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |