US1859660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling bit
Assignee: CHARLES E BURKE
•
Filing: 1929-11-20
•
Granted: 1932-05-24
•
Expires: 1949-11-20
Abstract
No abstract record available.
Inventors
- 👤 Emil M Erlandson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/42; E21B10/62; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17923
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) | 1935-05-24 | 1935-11-23 | 1936-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-24 | 1939-11-23 | 1940-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-24 | 1943-11-23 | 1944-05-24 | $7700.00 | Window Closed / Lapsed |