US3527253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning poppet spool valve
Assignee: King Valve Co
•
Filing: 1968-04-22
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Granted: 1970-09-08
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Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 Webster B Harpman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:34
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0603; F16K31/0624; F16K31/0634; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F16K11/00; F16K11/02; F16K11/04; F16K31/0627; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8667; Y10T137/86686
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2574096A
Cited
US2782801A
Cited
FR1206129A
Cited
US3092145A
Cited
US3060970A
Cited
US3270776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |