US2658716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual and automatic valve
Assignee: Individual
•
Filing: 1950-05-31
•
Granted: 1953-11-10
•
Expires: 1970-05-31
Abstract
No abstract record available.
Inventors
- 👤 Robert N Winfree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
F; F16; F16K; F16K23/00; Y; Y10; Y10S; Y10S251/00; Y10S251/90; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7613
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1165026A
Cited
US1480942A
Cited
US1539305A
Cited
US1575547A
Cited
US1777001A
Cited
US1800661A
Cited
GB471254A
Cited
GB540843A
Cited
US2606450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |