US4345645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas engine heater head
Assignee: United Stirling AB and Co
•
Filing: 1980-10-20
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Granted: 1982-08-24
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Expires: 2000-10-20
Abstract
Abstract A heater head for a multi-cylinder solar powered hot gas engine has a number of heater tubes lined on a conical wall exposed to the radiation. The tubes follow involute curves in two parts. The first parts leave very small gaps between them. The second parts arranged at a larger diameter from the center of said wall follow another involute each tube now leaving such gap relative its neighbor that a returned tube part may be arranged between.
Inventors
- 👤 Jan C. Bratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:36
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F24; F24S; F24S20/00; F24S20/20; F02G2254/00; F02G2254/30; F02G2255/00; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A multiple cylinder hot gas engine heater head in which a plurality of tubes connect the cylinders with the corresponding regenerator housings and in which each tube has a first curved part of a shape which corresponds substantially to the shape of an involute curve on a cone and in which the inner ends of the tubes start on a base circle and the first curved parts are juxtaposed so that constant gaps between the curved parts are obtained, characterized in that each tube has a second curved part following a different involute curve on the same cone starting in continuation of the said first curved part wherein the second curved parts are juxtaposed leaving a constant gap between the second curved parts.
Claim 2
Dependent Claim
123 words
A multiple cylinder hot gas engine heater head in which a plurality of tubes connect the cylinders with the corresponding regenerator housings and in which each tube has a first curved part of a shape which corresponds substantially to the shape of an involute curve on a cone and in which the inner ends of the tubes start on a base circle and the first curved parts are juxtaposed so that constant gaps between the curved parts are obtained, characterized in that each tube has a second curved part following a different involute curve on the same cone starting in continuation of the said first curved part wherein the second curved parts are juxtaposed leaving a constant gap between the second curved parts.
Claim 3
Dependent Claim
27 words
A heater head according to claim 1 wherein said second curved parts have inner end sections spaced apart on a larger base circle than said base circle.
Claim 4
Dependent Claim
63 words
A heater head according to claim 1 characterized in that the outer end section of the second curved part of each tube is bent 180 degrees and follows the different involute curve towards said larger base circle, each outer end section lying between two inner end sections and being juxtaposed to leave the same constant gap there-between as between said first curved parts.
References Cited (Backward Citations)
CA528864A
Cited
GB190008151A
Cited
US3074229A
Cited
US3117414A
Cited
US4055953A
Cited
US3965976A
Cited
DE2432958A1
Cited
US4069670A
Cited
US4044753A
Cited
US4030297A
Cited
US4206746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |