US1428137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-cutter drill bit
Assignee: Individual
•
Filing: 1921-08-01
•
Granted: 1922-09-05
•
Expires: 1941-08-01
Abstract
No abstract record available.
Inventors
- 👤 John J Bookhout
- 👤 James R Bookhout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:35
CPC Classifications
E; E21; E21B; E21B10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-09-04 | 1926-03-06 | 1926-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-09-04 | 1930-03-06 | 1930-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-09-04 | 1934-03-06 | 1934-09-05 | $7700.00 | Window Closed / Lapsed |