US3012540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drilling apparatus
Assignee: —
•
Filing: —
•
Granted: 1961-12-12
•
Expires: 1978-12-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:25
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/02; E21B6/04; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735646A
Cited
US1903232A
Cited
US2092822A
Cited
US2243585A
Cited
US2559012A
Cited
US2760437A
Cited
US2665645A
Cited
US2665644A
Cited
US2858772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |