US4108239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pipe
Assignee: Siemens AG
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Filing: 1976-03-22
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Granted: 1978-08-22
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Expires: 1996-03-22
Abstract
Abstract A heat pipe is disclosed which carries an evaporable working fluid and which includes a wick. More particularly, in accordance with the invention the wick comprises a first layer having a small-pore structure and disposed adjacent the vapor space within the pipe and a second layer having a large-pore structure and disposed adjacent the first layer.
Inventors
- 👤 Paul Fries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:49
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; B; B22; B22F; B22F7/00; B22F7/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A heat pipe adapted to carry an evaporable working fluid comprising: a wick disposed within the interior of said pipe so as to form a vapor space therein, said wick including a first layer which is situated adjacent said vapor space and which has a small-pore structure and a second layer which is situated adjacent said first layer and which has a large-pore structure, the diameter of the pores of said first layer being less than one-half the diameter of the pores of said second layer, said first layer constituting the boundary surface of said second layer to said vapor space and being a single layer of fine mesh net.
Claim 2
Dependent Claim
110 words
A heat pipe adapted to carry an evaporable working fluid comprising: a wick disposed within the interior of said pipe so as to form a vapor space therein, said wick including a first layer which is situated adjacent said vapor space and which has a small-pore structure and a second layer which is situated adjacent said first layer and which has a large-pore structure, the diameter of the pores of said first layer being less than one-half the diameter of the pores of said second layer, said first layer constituting the boundary surface of said second layer to said vapor space and being a single layer of fine mesh net.
Claim 3
Dependent Claim
30 words
A heat pipe in accordance with claim 1 in which said wick includes a third layer which is situated adjacent said second layer and the interior wall of said pipe.
Claim 4
Dependent Claim
28 words
A heat pipe in accordance with claim 1 in which the pores of said first layer have a diameter within a range from 5 μm to 100 μm.
Claim 5
Dependent Claim
23 words
A heat pipe in accordance with claim 1 in which the pores of said first layer have a diameter equal to 20 μm.
Claim 6
Dependent Claim
22 words
A heat pipe in accordance with claim 1 in which said second layer is wound from several layers of wide mesh net.
Claim 7
Dependent Claim
19 words
A heat pipe in accordance with claim 1 in which said second layer is a hollow, cylindrical sintered layer.
Claim 8
Dependent Claim
28 words
A heat pipe in accordance with claim 1 in which the pores of said second layer have a diameter within a range of 0.1 mm to 1 mm.
Claim 9
Dependent Claim
23 words
A heat pipe in accordance with claim 7 in which the pores of said second layer have a diameter equal to 0.5 mm.
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) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |