US2457960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1944-06-15
•
Granted: 1949-01-04
•
Expires: 1964-06-15
Abstract
No abstract record available.
Inventors
- 👤 William E Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:49
CPC Classifications
B; B23; B23Q; B23Q17/00; B23Q17/09; E; E21; E21B; E21B12/00; E21B12/02; Y; Y10; Y10T; Y10T407/00; Y10T407/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE201888C
Cited
US1508443A
Cited
US1786414A
Cited
US2007465A
Cited
US2132493A
Cited
US2296183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |