US3789920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer device
Assignee: National Aeronautics and Space Administration
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Filing: 1970-05-21
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Granted: 1974-02-05
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Expires: 1990-05-21
Abstract
Abstract A heat transfer device characterized by an hermetically sealed tubular housing including a tubular shell terminating in spaced end plates, and a tubular mesh wick concentrically arranged and operatively supported within said housing. A feature of the invention resides in the provision of an improved wicking restraint formed as an elongated and radially expanded tubular helix concentrically related to the wick and adapted to be axially foreshortened and radially expanded into engagement with the wick in response to an axially applied compressive load, whereby the wick continuously is supported in a contiguous relationship with the internal surfaces of the shell.
Inventors
- 👤 G Low
- 👤 R Kalkbrenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
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
133 words
An improved heat transfer device comprising: A. an elongated shell of a tubular configuration; B. a tubular wick concentrically related to said shell and seated therein; C. means for supporting said wick in contiguous engagement with the internal surfaces of said shell including, 1. a perforated body of a tubular configuration, 2. means for facilitating radial expansion of said body, including means defining a helical kerf extended along the body, whereby the body is adapted to be readily deformed in response to axially applied compressive stress, and 3. means for axially applying compressive stress to said body, including a pair of end plates integrally connected to said shell at the opposite ends thereof in contiguous engagement with the opposite ends of said perforated body; and D. a working fluid confined within said shell.
Claim 2
Dependent Claim
133 words
An improved heat transfer device comprising: A. an elongated shell of a tubular configuration; B. a tubular wick concentrically related to said shell and seated therein; C. means for supporting said wick in contiguous engagement with the internal surfaces of said shell including, 1. a perforated body of a tubular configuration, 2. means for facilitating radial expansion of said body, including means defining a helical kerf extended along the body, whereby the body is adapted to be readily deformed in response to axially applied compressive stress, and 3. means for axially applying compressive stress to said body, including a pair of end plates integrally connected to said shell at the opposite ends thereof in contiguous engagement with the opposite ends of said perforated body; and D. a working fluid confined within said shell.
Claim 3
Dependent Claim
35 words
means for facilitating radial expansion of said body, including means defining a helical kerf extended along the body, whereby the body is adapted to be readily deformed in response to axially applied compressive stress, and
Claim 4
Dependent Claim
35 words
means for facilitating radial expansion of said body, including means defining a helical kerf extended along the body, whereby the body is adapted to be readily deformed in response to axially applied compressive stress, and
Claim 5
Dependent Claim
45 words
means for axially applying compressive stress to said body, including a pair of end plates integrally connected to said shell at the opposite ends thereof in contiguous engagement with the opposite ends of said perforated body; and D. a working fluid confined within said shell.
Claim 6
Dependent Claim
45 words
means for axially applying compressive stress to said body, including a pair of end plates integrally connected to said shell at the opposite ends thereof in contiguous engagement with the opposite ends of said perforated body; and D. a working fluid confined within said shell.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |