Patent US3769674A successfully refreshed from Google Patents.
US3769674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing heat pipes
Assignee: Isothermics Inc
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Filing: 1972-10-10
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Granted: 1973-11-06
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Expires: 1992-10-10
Abstract
Abstract A method for producing heat pipes comprising the steps of providing a heat pipe with one end closed in the ordinary fashion, inserting the closed end of the heat pipe into a solution whose temperature is maintained below the triple point of the working fluid of the heat pipe charging the heat pipe with the working fluid which freezes near the bottom of the heat pipe, capping the open end of the heat pipe with a plug having a through passage, placing solder braze or weld material on the plug, evacuating the heat pipe to a desired low pressure, and activating heating means such as an induction coil to cause the solder material to flow into the clearance between the heat pipe wall and the plug and to flow into the passage in the plug to seal the formerly open end of the heat pipe with a positive metal seal.
Inventors
- 👤 J Droughton
- 👤 R Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:28
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/06; B23; B23K; B23K1/00; B23K1/002; F; F28; F28D; F28D15/00; F28D15/02; F28D15/0283; F28D15/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A method of manufacture comprising the steps of: a. providing a heat conductive hollow member have an open end; b. placing a working fluid in said hollow member; c. placing a plug in said open end with a passageway being formed to provide communication between the inside and outside of said hollow member; d. freezing the portion of the hollow member supporting the working fluid to a temperature below the triple point of the working fluid; e. thereafter evacuating the hollow member through said passageway; and f. subsequently heAt sealing the plug to the open end of the hollow member while closing said passageway.
Claim 2
Independent Claim
104 words
A method of manufacture comprising the steps of: a. providing a heat conductive hollow member have an open end; b. placing a working fluid in said hollow member; c. placing a plug in said open end with a passageway being formed to provide communication between the inside and outside of said hollow member; d. freezing the portion of the hollow member supporting the working fluid to a temperature below the triple point of the working fluid; e. thereafter evacuating the hollow member through said passageway; and f. subsequently heAt sealing the plug to the open end of the hollow member while closing said passageway.
Claim 3
Dependent Claim
37 words
The method of manufacture of claim 1 wherein said step of providing the heat conductive hollow member having an open end includes providing a heat conductive hollow member having a capillary section along the inner surface thereof.
Claim 4
Dependent Claim
27 words
The method of manufacture of claim 2 wherein said step of placing a plug in said open end includes placing a plug having an axial passageway therethrough.
Claim 5
Dependent Claim
59 words
The method of manufacture of claim 1 wherein said step of heat sealing the plug to the open end of the hollow member includes placing a fusable metal on said plug and thence heating the same to allow said fusable metal to flow into said passageway and to seal said plug to the open end of the hollow member.
Claim 6
Dependent Claim
66 words
The method manufacture of claim 4 wherein said step of placing a plug in said open end of the hollow member includes providing a plug which forms a clearance space between the plug and the hollow member, said step of heat sealing the plug includes heating the fusable metal to fill in the clearance space between the plug and the open end of the hollow member.
Claim 7
Dependent Claim
22 words
The method of manufacture of claim 5 wherein said heat sealing step includes inductively heating the fusable metal after evacuating the chamber.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |