US2956580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self sealing gate valve
Assignee: Individual
•
Filing: 1955-09-13
•
Granted: 1960-10-18
•
Expires: 1975-09-13
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/10; F16K27/105; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB187519A
Cited
US2065628A
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US2299517A
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US2332282A
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US2360599A
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US2317657A
Cited
US2530744A
Cited
US2514532A
Cited
US2591038A
Cited
US2657898A
Cited
US2751127A
Cited
US2726842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |