US1975656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve mechanism
Assignee: RUTH M HOOK
•
Filing: 1931-06-18
•
Granted: 1934-10-02
•
Expires: 1951-06-18
Abstract
No abstract record available.
Inventors
- 👤 Walter F Irvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
F; F23; F23N; F23N1/00; G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0675; G05D16/0683; G05D16/0686; G05D16/20; G05D16/2093; G05D16/2095; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7796; Y10T137/7831
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1937-10-01 | 1938-04-02 | 1938-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-01 | 1942-04-02 | 1942-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-01 | 1946-04-02 | 1946-10-02 | $7700.00 | Window Closed / Lapsed |