US3537681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve gate with deflectable faces
Assignee: Kerotest Manufacturing Corp
•
Filing: 1968-01-24
•
Granted: 1970-11-03
•
Expires: 1988-01-24
Abstract
No abstract record available.
Inventors
- 👤 Edward N Wrenshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:07
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/28; F16K3/02; F16K3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US176321A
Cited
US1526486A
Cited
US2195923A
Cited
US2457492A
Cited
US2984449A
Cited
US3002525A
Cited
US3088705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |