US2473537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary bit operating mechanism
Assignee: Individual
•
Filing: 1945-08-08
•
Granted: 1949-06-21
•
Expires: 1965-08-08
Abstract
No abstract record available.
Inventors
- 👤 Harry W Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US945209A
Cited
US1188001A
Cited
US1786173A
Cited
US1790460A
Cited
US1850403A
Cited
US2044349A
Cited
US2166937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |