US1946989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for rock drills
Assignee: Ingersoll Rand Co
•
Filing: 1931-12-17
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Granted: 1934-02-13
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Expires: 1951-12-17
Abstract
No abstract record available.
Inventors
- 👤 Sr William A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:51
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/14; B25D9/16; B25D9/22
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) | 1937-02-12 | 1937-08-14 | 1938-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-02-12 | 1941-08-14 | 1942-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-02-12 | 1945-08-14 | 1946-02-13 | $7700.00 | Window Closed / Lapsed |