US2693345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth-boring apparatus
Assignee: Individual
•
Filing: 1950-01-10
•
Granted: 1954-11-02
•
Expires: 1970-01-10
Abstract
No abstract record available.
Inventors
- 👤 James A Martin
- 👤 Frank J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:13
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B7/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1997887A
Cited
US1932068A
Cited
US1978084A
Cited
US2161000A
Cited
US2146732A
Cited
US2234451A
Cited
US2283510A
Cited
US2529246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |