US1874133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve mechanism for rock drills
Assignee: Ingersoll Rand Co
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Filing: 1928-09-07
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Granted: 1932-08-30
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Expires: 1948-09-07
Abstract
No abstract record available.
Inventors
- 👤 Jr William A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:40
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/14; B25D9/16; B25D9/24
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) | 1935-08-30 | 1936-02-29 | 1936-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-30 | 1940-02-29 | 1940-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-30 | 1944-02-29 | 1944-08-30 | $7700.00 | Window Closed / Lapsed |