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US3672020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heat pipe having an easily contaminated internal wetting surface
Assignee: RCA Corp
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Filing: 1970-05-18
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Granted: 1972-06-27
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Expires: 1990-05-18
Abstract
Abstract A novel method of making a heat pipe having an easily contaminated internal wetting surface, comprising cleaning the surface and then coating the cleaned surface with a material that is soluble in the working fluid at an operating temperature of the heat pipe. For a heat pipe employing a mercury metal working fluid, easily-oxidized ferrous metal surfaces of the capillary structure and envelope inner wall may be coated with nickel.
Inventors
- 👤 Robert Alfred Freggens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28F; F28F19/00; F28F19/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353; Y10T29/4981; Y10T29/49812; Y10T29/49826; Y10T29/49885
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
12 words
The method of claim 1, wherein said capillary structure comprises said surface.
Claim 2
Dependent Claim
15 words
The method of claim 1, wherein the inner wall of said envelope comprises said surface.
Claim 3
Independent Claim
124 words
A method of making a heat pipe comprising a sealed envelope containing a capillary structure, including at least one ferrous metal surface in said heat pipe being wettable by a mercury metal working fluid, comprising the steps of: a. cleaning said surface to remove oxides therefrom; b. coating said cleaned surface with a thin layer of a metal soluble in said working fluid at an operating temperature of said heat pipe in order to protect said cleaned surface from contamination and to reduce the erosive action or said mercury metal working fluid during operation; c. assembling said heat pipe; d. adding said mercury metal working fluid to said assembled heat pipe; e. evacuating said assembled heat pipe; and f. sealing said evacuated heat pipe.
Claim 4
Dependent Claim
17 words
The method of claim 4, wherein said capillary structure is of stainless steel and comprises said surface.
Claim 5
Dependent Claim
11 words
The method of claim 4, wherein said soluble metal is nickel.
Claim 6
Dependent Claim
18 words
The method of claim 6, wherein said nickel coating is applied by plating prior to said assembling step.
Claim 7
Independent Claim
130 words
A method of making a heat pipe comprising a sealed envelope containing an inner wall and a capillary structure each having a ferrous metal surface that is wettable by a mercury metal working fluid, comprising the steps of: a. cleaning each of said surfaces to remove oxides therefrom; b. coating each of said cleaned surfaces with a thin layer of a metal that is soluble in said working fluid at an operating temperature of said heat pipe in order to protect said cleaned surface from contamination and to reduce The erosive action of said mercury metal working fluid during operation; c. assembling said heat pipe; d. adding said mercury metal working fluid to said assembled heat pipe; e. evacuating said assembled heat pipe; and f. sealing said evacuated heat pipe.
Claim 8
Dependent Claim
11 words
The method of claim 8, wherein said soluble metal is nickel.
Claim 9
Dependent Claim
23 words
The method of claim 9, wherein the amount of said soluble metal in said coatings is sufficient to saturate said working fluid therewith.
References Cited (Backward Citations)
US1663709A
Cited
US1748518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |