US2815936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bits
Assignee: Reed Roller Bit Co
•
Filing: 1951-12-24
•
Granted: 1957-12-10
•
Expires: 1971-12-24
Abstract
No abstract record available.
Inventors
- 👤 Robert G Peter
- 👤 Elmer J Volmert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:19
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1656471A
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US2013839A
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US2068375A
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US2072627A
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US2141841A
Cited
US2201569A
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US2329745A
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US2538211A
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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) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |