US2991794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for fluids having entrained solids
Assignee: Everlasting Valve Co Inc
•
Filing: 1958-04-03
•
Granted: 1961-07-11
•
Expires: 1978-04-03
Abstract
No abstract record available.
Inventors
- 👤 Harrower William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:18
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/04; F16K3/06; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4259; Y10T137/4273
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2273720A
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US2591429A
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US2720370A
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US2851051A
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US2824715A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |