US3741172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system expansion chambers
Assignee: Renault SA
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Filing: 1971-06-28
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Granted: 1973-06-26
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Expires: 1991-06-28
Abstract
Abstract Glass expansion chamber connected to cooling system by a tube going down to bottom of chamber, characterized by a pressure relief valve fitted between the aforementioned system and the expansion chamber, with a valve allowing air to enter from the outside if pressure drops in system fitted to expansion chamber stopper.
Inventors
- 👤 B Andreux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:42
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/02; F01P11/029; F01P11/0204; F01P11/0209; F01P11/0238
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
An apparatus for use in a cooling system comprising an expansion chamber for receiving cooling liquid ejected from the cooling system having a plug at the top to seal the chamber and connected to the cooling system by a tube whiCh extends down to the bottom of said chamber; a pressure relief valve located on the connecting tube whereby excess steam generated in said cooling system is vented to the atmosphere; and a low-pressure valve located on said plug for said expansion chamber whereby air is allowed to enter said chamber from the outside when the pressure drops in the system.
Claim 2
Independent Claim
101 words
An apparatus for use in a cooling system comprising an expansion chamber for receiving cooling liquid ejected from the cooling system having a plug at the top to seal the chamber and connected to the cooling system by a tube whiCh extends down to the bottom of said chamber; a pressure relief valve located on the connecting tube whereby excess steam generated in said cooling system is vented to the atmosphere; and a low-pressure valve located on said plug for said expansion chamber whereby air is allowed to enter said chamber from the outside when the pressure drops in the system.
Claim 3
Dependent Claim
51 words
An apparatus according to claim 1 wherein said pressure relief valve is located on said plug of said expansion chamber and wherein said valve is connected to the top part of said tube extending down to the bottom of said chamber by a by-pass tube which is located beneath said plug.
Claim 4
Dependent Claim
42 words
An apparatus according to claim 2 wherein said relief valve and said low-pressure valve are fitted concentrically one inside the other and the two valves are connected to the tube extending down to the bottom of the chamber by said by-pass tube.
Claim 5
Dependent Claim
123 words
An apparatus according to claim 3 wherein said relief valve comprises a bell-shaped member secured to the top of said plug and positioned over said by-pass tube, said relief valve further comprising a cover means fitting in a sealing arrangement over the end of said by-pass tube and a spring between the under side of said bell-shaped member and said cover means to maintain said cover means in spring fitted engagement over the end of said by-pass tube; and said low-pressure valve comprises an opening in the top of said cover means of the relief valve and a spring operated closure means for said opening whereby the valve is normally closed and only opens in response to low pressure under said cover means.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 2 wherein said by-pass tube and said tube extending down to the bottom of said chamber consist of a rubber Y-shaped tubular part.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |