Patent US2536528A successfully refreshed from Google Patents.
US2626128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Reed Roller Bit Co
•
Filing: 1951-09-24
•
Granted: 1953-01-20
•
Expires: 1971-09-24
Abstract
No abstract record available.
Inventors
- 👤 Elvin G Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US92014A
Cited
US474297A
Cited
US1302967A
Cited
US1010127A
Cited
US1502851A
Cited
US1540882A
Cited
US1885085A
Cited
US2121202A
Cited
US2200281A
Cited
US2177332A
Cited
US2213351A
Cited
US2290933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-20 | 1956-07-21 | 1957-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-20 | 1960-07-21 | 1961-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-20 | 1964-07-21 | 1965-01-20 | $7700.00 | Window Closed / Lapsed |