US2545035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary well drilling bit
Assignee: Individual
•
Filing: 1947-10-13
•
Granted: 1951-03-13
•
Expires: 1967-10-13
Abstract
No abstract record available.
Inventors
- 👤 Archer W Kammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:27
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US449613A
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US465103A
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US1678075A
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US789929A
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US1006446A
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US1031628A
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US1179284A
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US1133481A
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US1183630A
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US1372894A
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US1369959A
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US1414704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |