US3964902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a wick for a heat pipe
Assignee: National Aeronautics and Space Administration
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Filing: 1974-02-27
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Granted: 1976-06-22
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Expires: 1994-02-27
Abstract
Abstract A method of forming a tubular wick for a heat pipe. The method is characterized by the steps of forming a wick blank of a predetermined thickness comprising a plurality of superimposed layers of stainless steel mesh screen, wet rolling the blank for reducing the thickness thereof, wrapping the blank about an inner mandrel, compressing the blank into a rigid tubular structure, removing the tubular structure from the mandrel and sintering the tubular structure.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 Frank G. Arcella
- 👤 Ernest C. Phillips, Jr.
- 👤 Richard P. Sprecace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/26; B22; B22F; B22F3/00; B22F3/002; F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; B22F2998/00; B22F2998/10; F28F; F28F2200/00; F28F2200/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353; Y10T29/4981; Y10T428/00; Y10T428/12; Y10T428/12347; Y10T428/12444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A method for forming a wick for a heat transfer pipe adapted to utilize evaporation, condensation and surface tension characteristics of a working fluid within a closed ocntainer, comprising the steps of: A. forming a blank from which a wick is to be shaped by folding a sheet of metallic screen of fine mesh into superimposed layers, uniting said superimposed layers by spotwelding the layers together, saturating said layers with water, and flat rolling the layers while in a saturated condition, whereby said blank is plasticized for reducing the size of the mesh opening; B. permanently deforming the blank into a cylindrical structure by wrapping the blank about an inner mandrel and inserting the inner mandrel into an outer mandrel of a cylindrical configuration and swaging the mandrels and the blank; C. disassociating the mandrels from the blank by selectively etching the mandrels; and D. sintering the blank by subjecting the blank to elevated temperatures in a high vacuum environment.
Claim 2
Independent Claim
160 words
A method for forming a wick for a heat transfer pipe adapted to utilize evaporation, condensation and surface tension characteristics of a working fluid within a closed ocntainer, comprising the steps of: A. forming a blank from which a wick is to be shaped by folding a sheet of metallic screen of fine mesh into superimposed layers, uniting said superimposed layers by spotwelding the layers together, saturating said layers with water, and flat rolling the layers while in a saturated condition, whereby said blank is plasticized for reducing the size of the mesh opening; B. permanently deforming the blank into a cylindrical structure by wrapping the blank about an inner mandrel and inserting the inner mandrel into an outer mandrel of a cylindrical configuration and swaging the mandrels and the blank; C. disassociating the mandrels from the blank by selectively etching the mandrels; and D. sintering the blank by subjecting the blank to elevated temperatures in a high vacuum environment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |