Patent US2369714A successfully refreshed from Google Patents.
US2369714A
Expired / Lapsed
US
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Valve for rock drills
Assignee: Ingersoll Rand Co
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Filing: 1943-09-30
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Granted: 1945-02-20
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Expires: 1963-09-30
Abstract
No abstract record available.
Inventors
- 👤 Walter E Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:50
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/14; B25D9/16; B25D9/20; B25D2209/00; B25D2209/005
Claims Analysis
Total Claims: 0
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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) | 1948-02-20 | 1948-08-21 | 1949-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-02-20 | 1952-08-21 | 1953-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-02-20 | 1956-08-21 | 1957-02-20 | $7700.00 | Window Closed / Lapsed |