US1465568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reducing valve for rock drills
Assignee: Ingersoll Rand Co
•
Filing: 1920-07-06
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Granted: 1923-08-21
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Expires: 1940-07-06
Abstract
No abstract record available.
Inventors
- 👤 Albert H Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:01
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/086; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86662
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) | 1926-08-20 | 1927-02-19 | 1927-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-08-20 | 1931-02-19 | 1931-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-08-20 | 1935-02-19 | 1935-08-21 | $7700.00 | Window Closed / Lapsed |