US2021532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for pumps and other fluid circulation apparatus or lines
Assignee: Individual
•
Filing: 1934-03-01
•
Granted: 1935-11-19
•
Expires: 1954-03-01
Abstract
No abstract record available.
Inventors
- 👤 Richard H Wainford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:19
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K27/00; F16K27/02; F16K27/0209; F16K27/0227; F16K27/0232; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7668; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/79
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) | 1938-11-18 | 1939-05-20 | 1939-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-18 | 1943-05-20 | 1943-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-18 | 1947-05-20 | 1947-11-19 | $7700.00 | Window Closed / Lapsed |