US1344490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Six-way valve
Assignee: KEYSTONE DRILLER CO
•
Filing: 1919-02-07
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Granted: 1920-06-22
•
Expires: 1939-02-07
Abstract
No abstract record available.
Inventors
- 👤 Robert M Downie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:34
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/06; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86654; Y10T137/86839; Y10T137/86863; Y10T137/86871
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) | 1923-06-22 | 1923-12-22 | 1924-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-06-22 | 1927-12-22 | 1928-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-06-22 | 1931-12-22 | 1932-06-22 | $7700.00 | Window Closed / Lapsed |