Patent US4339306A successfully refreshed from Google Patents.
Patent US2889077A successfully refreshed from Google Patents.
Patent US2250449A successfully refreshed from Google Patents.
US2250449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid actuated hammer
Assignee: Ingersoll Rand Co
•
Filing: 1941-02-24
•
Granted: 1941-07-29
•
Expires: 1961-02-24
Abstract
No abstract record available.
Inventors
- 👤 Ernest G Eppens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:30
CPC Classifications
B; B21; B21J; B21J7/00; B21J7/20; B21J7/46; B21J7/36; B21J7/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-28 | 1945-01-27 | 1945-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-28 | 1949-01-27 | 1949-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-28 | 1953-01-27 | 1953-07-29 | $7700.00 | Window Closed / Lapsed |