Patent US3913781A successfully refreshed from Google Patents.
US3913781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion tanks of cooling systems
Assignee: Renault SA
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Filing: 1974-10-04
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Granted: 1975-10-21
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Expires: 1994-10-04
Abstract
Abstract An expansion tank for a cooling system of the type having a pressure-vacuum valve capsule wherein the tank and cap are formed of a plastic material and are threadably engagable and the pressure-vacuum valve capsule is arranged for mounting therebetween within a neck portion of the tank so as to provide a seal between the tank and the cap simply by screwing the cap thereon.
Inventors
- 👤 Bernard Andreux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/02; F01P11/029
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
An expansion tank for a cooling system comprising: a plastic tank body having an externally threaded neck portion; a plastic cap having an internally threaded portion and being adapted to be threadably engaged upon said neck portion of said tank body; a metallic pressure vacuum valve capsule having means thereon for seating upon the edge of said neck portion for supporting said capsule in said tank body; means on the inner portion of said cap for engaging said capsule upon threadably tightening said cap on said tank body for causing said capsule to serve as a seal betweEn the tank and the cap simply by screwing said cap thereon; and said cap having holes from the exterior opening into air passage gaps at the level of said seal, said gaps having a slope of inclined separation in the same sense as the cap threads.
Claim 2
Dependent Claim
144 words
An expansion tank for a cooling system comprising: a plastic tank body having an externally threaded neck portion; a plastic cap having an internally threaded portion and being adapted to be threadably engaged upon said neck portion of said tank body; a metallic pressure vacuum valve capsule having means thereon for seating upon the edge of said neck portion for supporting said capsule in said tank body; means on the inner portion of said cap for engaging said capsule upon threadably tightening said cap on said tank body for causing said capsule to serve as a seal betweEn the tank and the cap simply by screwing said cap thereon; and said cap having holes from the exterior opening into air passage gaps at the level of said seal, said gaps having a slope of inclined separation in the same sense as the cap threads.
Claim 3
Dependent Claim
23 words
An expansion tank as set forth in claim 1, further comprising means for effecting evacuation of the tank body from the bottom thereof.
Claim 4
Dependent Claim
71 words
An expansion tank as set forth in claim 1, wherein said sealing means of said metallic pressure-vacuum valve capsule is a projecting circular flange enclosed in said neck of said expansion tank for being pressed against said neck edge, and further comprising an intervening gasket disposed between one side of said flange and said neck edge, whereby said cap presses on the opposite side of said flange for effecting said seal.
References Cited (Backward Citations)
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |