US4069670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas engine heater head
Assignee: United Stirling AB and Co
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Filing: 1976-08-02
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Granted: 1978-01-24
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Expires: 1996-08-02
Abstract
Abstract In a heater head for a hot gas engine the connection between the regenerator tops and the cylinder tops consists of pipes of equal shape and dimensions. The pipes are shaped partly as involutes on a cone partly as straight tubes on a cylinder surface to ensure uniform gaps between them.
Inventors
- 👤 Jan Christer Bratt
- 👤 Stefan Istvan Lorant
- 👤 Bengt-Ove Moody Moodysson
- 👤 Nils Kaj Gunnar Rosenqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:33
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0012; F28D9/0018; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F02G2255/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A multiple cylinder hot gas engine heater head wherein a single heater passes hot gases over a plurality of heater pipes generally connecting respective cylinders with corresponding regenerator housings, characterized in that, the heater pipes have a curved portion of a shape which corresponds substantially to the shape of an involute curve upon a conical surface with the curved portions of a plurality of the heater pipes being disposed uniformly side-by-side and equi-spaced.
Claim 2
Dependent Claim
73 words
A multiple cylinder hot gas engine heater head wherein a single heater passes hot gases over a plurality of heater pipes generally connecting respective cylinders with corresponding regenerator housings, characterized in that, the heater pipes have a curved portion of a shape which corresponds substantially to the shape of an involute curve upon a conical surface with the curved portions of a plurality of the heater pipes being disposed uniformly side-by-side and equi-spaced.
Claim 3
Dependent Claim
15 words
A heater head as defined in claim 1 wherein all the heater pipes are similar.
Claim 4
Dependent Claim
26 words
A heater head as defined in claim 1 including a manifold connecting the curved portions of a plurality of the heater pipes to said regenerator housings.
Claim 5
Dependent Claim
22 words
A heater head as defined in claim 3 wherein said manifold comprises substantially a ring portion disposed coaxially with said central axis.
Claim 6
Dependent Claim
45 words
A heater head as defined in claim 1 wherein the heater passes said gases generally along a central axis, and each heater pipe has connected to said cuved portion a substantially straight portion constituted by a member disposed substantially only parallel to said central axis.
Claim 7
Dependent Claim
23 words
A heater head as defined in claim 5 including a manifold connecting a plurality of said substantially straight portions to a respective cylinder.
Claim 8
Dependent Claim
21 words
A heater head as defined in claim 6 wherein said manifold comprises a ring portion disposed coaxially with said central axis.
Claim 9
Dependent Claim
26 words
A heater head as defined in claim 5 wherein the straight portions of all pipes extend along a single right-cylindrical surface coaxial with said central axis.
Claim 10
Dependent Claim
22 words
A heater head as defined in claim 8 wherein said curved portions extend outwardly from said axis from the respective straight portions.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |