Patent EP0299772A2 successfully refreshed from Google Patents.
US4159737A
Expired / Lapsed
US
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Heat pipe
Assignee: US Philips Corp
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Filing: 1977-08-29
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Granted: 1979-07-03
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Expires: 1997-08-29
Abstract
Abstract A heat pipe contains a getter for gaseous impurities arranged in the vapor space and distributed between the vaporization wall and the condensation wall.
Inventors
- 👤 Udo K. P. Biermann
- 👤 Willem L. N. VAN DER Sluys
- 👤 Johannes C. M. Roelofs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:34
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/0258
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A heat pipe which comprises a closed reservoir having at least one vaporization wall and at least one condensation wall; a heat transport medium in said reservoir for flowing in the vapour phase from the vaporization wall via at least one duct for vapour to the condensation wall during operation and for returning in the liquid phase via at least one duct for liquid to the vaporization wall; and at least one getter for gaseous impurities provided in said vapour duct and extending from the vaporization wall to the condensation wall and active at least at the operating temperature.
Claim 2
Dependent Claim
99 words
A heat pipe which comprises a closed reservoir having at least one vaporization wall and at least one condensation wall; a heat transport medium in said reservoir for flowing in the vapour phase from the vaporization wall via at least one duct for vapour to the condensation wall during operation and for returning in the liquid phase via at least one duct for liquid to the vaporization wall; and at least one getter for gaseous impurities provided in said vapour duct and extending from the vaporization wall to the condensation wall and active at least at the operating temperature.
Claim 3
Dependent Claim
29 words
A heat pipe according to claim 1, in which the getter is sub-divided into portions distributed at intervals from each other over the flow path in the vapour duct.
Claim 4
Dependent Claim
20 words
A heat pipe according to claim 2, in which the getter portions are provided at regular intervals from each other.
Claim 5
Dependent Claim
21 words
A heat pipe according to claim 2, in which the getter is contained in a gas-permeable holder connected to the reservoir.
Claim 6
Dependent Claim
19 words
A heat pipe according to claim 4, in which the gas-permeable holder consists of a roll of metal gauze.
Claim 7
Dependent Claim
34 words
A heat pipe according to claim 2, in which the heat transport medium comprises one or more of Na, K, and Cs, and the getter comprises one or more of La, Y, and Sc.
Claim 8
Dependent Claim
30 words
A heat pipe according to claim 6, in which the getter comprises one or more of La, Y, and Sc combined with one or more of Ba, Ca, and Li.
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) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |