US2620162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer type rotary rock-drilling bit
Assignee: Individual
•
Filing: 1946-11-16
•
Granted: 1952-12-02
•
Expires: 1966-11-16
Abstract
No abstract record available.
Inventors
- 👤 Pennington Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:32
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US878856A
Cited
US1065298A
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US1695452A
Cited
US1892517A
Cited
US2344725A
Cited
US2312290A
Cited
US2422031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |