US2857129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve with fluid responsive seal therefor
Assignee: Hydro Aire Inc
•
Filing: 1953-04-28
•
Granted: 1958-10-21
•
Expires: 1973-04-28
Abstract
No abstract record available.
Inventors
- 👤 J Homer H Overholser
- 👤 Lloyd E Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:46
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0227
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US420155A
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US1095212A
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BE503511A
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US2732170A
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FR802047A
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US2238357A
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US2370751A
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US2606740A
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US2701117A
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GB671546A
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US2705019A
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FR1053141A
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US2696967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |