Patent US4095575A successfully refreshed from Google Patents.
US4095575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Audi AG
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Filing: 1976-06-30
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Granted: 1978-06-20
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Expires: 1996-06-30
Abstract
Abstract An internal combustion engine is provided with a liquid circuit in which, until a predetermined temperature is reached, a thermostat causes the liquid to pass through a heat exchanger acted on by hot exhaust gases. Such devices can be used both for warming up the liquid in the coolant circuit of an engine in order to obtain rapid warming-up of the engine, and also for heating a liquid provided for heating the engine induction system.
Inventors
- 👤 Leitermann Wulf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/14; F01P7/16; F01P2037/00; F01P2037/02; F01P2060/00; F01P2060/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
An internal combustion engine having a cooling liquid circuit comprising a cooling jacket, a radiator and supply and return pipes between the cooling jacket and the radiator, a heat exchanger traversed by an exhaust gas pipe, the heat exchanger being mounted above the liquid level of the circuit, a supply connection connecting said heat exchanger to said supply pipe, a return connection connecting the upper part of said heat exchanger to said return pipe, a drain connecting the lowest point of the heat exchanger to said circuit, and a thermostat valve for controlling the flow of liquid from said supply pipe to said heat exchanger and radiator in such way that when a predetermined temperature of the liquid is reached the supply pipe is cut off from the heat exchanger and connected solely to said radiator.
Claim 2
Dependent Claim
136 words
An internal combustion engine having a cooling liquid circuit comprising a cooling jacket, a radiator and supply and return pipes between the cooling jacket and the radiator, a heat exchanger traversed by an exhaust gas pipe, the heat exchanger being mounted above the liquid level of the circuit, a supply connection connecting said heat exchanger to said supply pipe, a return connection connecting the upper part of said heat exchanger to said return pipe, a drain connecting the lowest point of the heat exchanger to said circuit, and a thermostat valve for controlling the flow of liquid from said supply pipe to said heat exchanger and radiator in such way that when a predetermined temperature of the liquid is reached the supply pipe is cut off from the heat exchanger and connected solely to said radiator.
Claim 3
Dependent Claim
41 words
An engine according to claim 1, in which an overflow or expansion tank is connected to the liquid circuit, the volume of the overflow or expansion tank being at least equal to the volume of the liquid of the heat exchanger.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |