Patent US2378495A successfully refreshed from Google Patents.
Patent US3797086A successfully refreshed from Google Patents.
US3797086A
Expired / Lapsed
US
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Method of closing off a heat pipe
Assignee: US Philips Corp
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Filing: 1972-11-12
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Granted: 1974-03-19
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Expires: 1992-11-12
Abstract
Abstract A method of closing off a heat pipe of hydrogen-permeable material subsequent to evacuation of undesirable gases, the heat pipe is filled with hydrogen, is then sealed, and finally the hydrogen is removed by diffusion through the wall of the pipe.
Inventors
- 👤 G Asselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:42
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/0283; Y; Y10; Y10S; Y10S29/00; Y10S29/034; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A method of closing off a heat pipe, at least a part of which is hydrogen permeable and in which a sealing place is sealed while heating it to at least its softening temperature, said method comprising evacuating undesirable gases from the heat pipe, filling the evacuated heat pipe wth hydrogen, then sealing the heat pipe, and subsequently removing the hydrogen into the atmosphere by diffusion of the hydrogen through the wall of the heat pipe.
Claim 2
Independent Claim
76 words
A method of closing off a heat pipe, at least a part of which is hydrogen permeable and in which a sealing place is sealed while heating it to at least its softening temperature, said method comprising evacuating undesirable gases from the heat pipe, filling the evacuated heat pipe wth hydrogen, then sealing the heat pipe, and subsequently removing the hydrogen into the atmosphere by diffusion of the hydrogen through the wall of the heat pipe.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, wherein the hydrogen pressure in the heat pipe during sealing is equal to or substantially equal to the ambient pressure.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1 wherein the heat pipe is heated in order to increase the rate of the hydrogen diffusion to the atmosphere.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1, wherein the heat pipe is provided with a window of a material which has a larger permeability for hydrogen than the material of the heat pipe.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 4, wherein the window consists of nickel or an alloy thereof, for example, an iron-nickel alloy.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 4, wherein the window consists of palladium or an alloy thereof, for example, a silver-palladium alloy.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |