Patent US3844341A successfully refreshed from Google Patents.
US3844341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable finned heat transfer device
Assignee: United States Department of the Navy
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Filing: 1972-05-22
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Granted: 1974-10-29
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Expires: 1992-05-22
Abstract
Abstract A heat transfer device includes first and second members mounted for continuous relative rotation in either of a clockwise or a counterclockwise direction while maintaining substantially equally sized gaps between a plurality of equally spaced concentric fins which are alternately disposed in overlapping relationship.
Inventors
- 👤 J Bimshas
- 👤 E Hickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:34
CPC Classifications
F; F28; F28D; F28D11/00; F28D11/02; F28D15/00; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10T; Y10T74/00; Y10T74/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A heat transfer device comprising: a first member adapted for connection to a heat source and having a plurality of equally spaced parallel faced fins; a second member adapted for connection to a heat sink and having a plurality of equally spaced parallel faced fins alternately disposed in overlapping relationship with the first member fins to form substantially equally sized gaps therebetween; the fins of the first and second members forming concentric hollow cylinders and being mounted for continuous relative rotation while maintaining the substantially equally sized gaps; and means providing helium gas under pressure filling said gaps between said fins.
Claim 2
Dependent Claim
101 words
A heat transfer device comprising: a first member adapted for connection to a heat source and having a plurality of equally spaced parallel faced fins; a second member adapted for connection to a heat sink and having a plurality of equally spaced parallel faced fins alternately disposed in overlapping relationship with the first member fins to form substantially equally sized gaps therebetween; the fins of the first and second members forming concentric hollow cylinders and being mounted for continuous relative rotation while maintaining the substantially equally sized gaps; and means providing helium gas under pressure filling said gaps between said fins.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |