US4174616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated cylinder sleeve for a hot-gas engine
Assignee: US Philips Corp
•
Filing: 1977-08-01
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Granted: 1979-11-20
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Expires: 1997-08-01
Abstract
Abstract A hot-gas engine having a heat insulating lining of loose grains surrounding the hot working medium spaces of the cylinder and the regenerator housing.
Inventors
- 👤 Anton M. Nederlof
- 👤 George A. A. Asselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:58
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02F; F02F1/00; F02F1/02; F02F1/04; F02F1/06; F02F1/08; F02G2257/00; F02G2258/00; F02G2258/10; F02G2258/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A hot-gas engine, comprising at least one metal housing which envelops a chamber in which a pressurized working medium is present during operation, and a layer of a heat insulating material on at least part of the inner side of the housing, characterized in that the engine includes a metal sleeve bounding a portion of the chamber and defining an inner wall of an annular spaced formed at least substantially by the inner wall of the housing and the metal sleeve, the insulating layer consisting of granular material filling the annular space such that the metal sleeve presses against and is supported by the grains of insulating material, whereby the insulating material provides structural support for the sleeve against the effects of internal pressure in the chamber.
Claim 2
Dependent Claim
127 words
A hot-gas engine, comprising at least one metal housing which envelops a chamber in which a pressurized working medium is present during operation, and a layer of a heat insulating material on at least part of the inner side of the housing, characterized in that the engine includes a metal sleeve bounding a portion of the chamber and defining an inner wall of an annular spaced formed at least substantially by the inner wall of the housing and the metal sleeve, the insulating layer consisting of granular material filling the annular space such that the metal sleeve presses against and is supported by the grains of insulating material, whereby the insulating material provides structural support for the sleeve against the effects of internal pressure in the chamber.
Claim 3
Dependent Claim
34 words
A hot-gas engine as claimed in claim 1, characterized in that the annular space communicates with a space in which a pressure prevails which is lower than the working medium pressure in the chamber.
Claim 4
Dependent Claim
22 words
A hot-gas engine as claimed in claim 2, characterized in that the annular space communicates with the ambient atmosphere via a filter.
Claim 5
Dependent Claim
30 words
A hot-gas engine as claimed in claim 1, characterized in that the annular space communicates with the chamber via a non-return valve which opens in the direction of the chamber.
Claim 6
Dependent Claim
14 words
A hot-gas engine as claimed in claim 1, wherein the granular material is sand.
Claim 7
Dependent Claim
15 words
A hot-gas engine as claimed in claim 1, wherein the granular material is zirconium oxide.
References Cited (Backward Citations)
US1277849A
Cited
US1758474A
Cited
US2073385A
Cited
FR1267859A
Cited
DE1965849U
Cited
US3490234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |