US2661925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing means for fluid valves
Assignee: Individual
•
Filing: 1950-03-24
•
Granted: 1953-12-08
•
Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 Richard C Barkelew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:23
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/10; F16K11/20; F16K11/202; Y; Y10; Y10S; Y10S251/00; Y10S251/90; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/87096; Y10T137/87121; Y10T137/87129; Y10T137/87137; Y10T137/87571; Y10T137/87676; Y10T137/87684; Y10T137/87692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE40549C
Cited
DE486318C
Cited
GB191400309A
Cited
GB191509164A
Cited
US1510528A
Cited
US1537948A
Cited
US1667580A
Cited
US2124155A
Cited
US2277251A
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US2360733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |