US2851253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Reed Roller Bit Co
•
Filing: 1954-04-27
•
Granted: 1958-09-09
•
Expires: 1974-04-27
Abstract
No abstract record available.
Inventors
- 👤 Elvin G Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:18
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1143275A
Cited
US1905165A
Cited
US2184066A
Cited
US2248340A
Cited
US2527838A
Cited
US2660405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |