US2917025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic drill hammer
Assignee: Individual
•
Filing: 1958-06-03
•
Granted: 1959-12-15
•
Expires: 1978-06-03
Abstract
No abstract record available.
Inventors
- 👤 Richard O Dulaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:42
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2673713A
Cited
US2851251A
Cited
US2813516A
Cited
US2800884A
Cited
US2837317A
Cited
US2887989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |