Patent US4274479A successfully refreshed from Google Patents.
US4274479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered grooved wicks
Assignee: Aavid Thermal Corp
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Filing: 1978-09-21
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Granted: 1981-06-23
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Expires: 1998-09-21
Abstract
Abstract A heat pipe capillary wick constructed from a sintered metal cylinder formed in close contact with the inner diameter of the heat pipe casing, and containing longitudinal grooves on the wick's inner surface, adjacent to the vapor space. The grooves provide longitudinal capillary pumping while the high capillary pressure of the sintered wick provides liquid to fill the grooves and assure effective circumferential distribution of liquid in the heat pipe.
Inventors
- 👤 George Y. Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:08
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A heat pipe comprising: an outer casing means forming a vacuum tight enclosure; and a wick means constructed from sintered material in intimate surface contact with the inner surface of the casing means, said wick means containing at least one longitudinal capillary groove located on the surface of the wick means adjacent to an open volume intended as the heat pipe vapor space and designed to provide longitudinal capillary pumping of the liquid.
Claim 2
Dependent Claim
73 words
A heat pipe comprising: an outer casing means forming a vacuum tight enclosure; and a wick means constructed from sintered material in intimate surface contact with the inner surface of the casing means, said wick means containing at least one longitudinal capillary groove located on the surface of the wick means adjacent to an open volume intended as the heat pipe vapor space and designed to provide longitudinal capillary pumping of the liquid.
Claim 3
Dependent Claim
34 words
A heat pipe as in claim 1 wherein the grooves are formed with neck widths smaller than base widths, and the ends of the grooves terminate before reaching the ends of the heat pipe.
Claim 4
Dependent Claim
14 words
A heat pipe as in claim 1 wherein the sintered material is metal powder.
Claim 5
Dependent Claim
14 words
A heat pipe as in claim 1 wherein the sintered material is ceramic powder.
Claim 6
Dependent Claim
38 words
A heat pipe as in claim 1 wherein the sintered material forms a continuous layer around the inner surface of the heat pipe casing between the grooves and the casing to provide circumferential liquid circulation within the wick.
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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |