US3921710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pipe and manufacturing method thereof
Assignee: Tokico Ltd
•
Filing: 1973-08-22
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Granted: 1975-11-25
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Expires: 1993-08-22
Abstract
Abstract A heat pipe comprises a hollow wick impregnated with a liquid heat medium and an outer tubular cylinder within which the wick is installed and hermetically sealed. The wick is made up of a ribbon-shaped material of relatively narrow width wound in the form of a helix and is fabricated by winding the wick material preferably in alternately opposite helical directions on a mandrel, which is thereafter extracted to leave a hollow tubular wick.
Inventors
- 👤 Masayoshi Katayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:19
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353; Y10T29/496; Y10T29/49602
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A heat pipe comprising a hollow wick impregnated with a liquid heat medium and an outer tubular cylinder accommodating said wick in a hermetically sealed condition, said wick including a ribbon-shaped material wound in the form of a helix, mutually adjacent lateral edges of said wick material being disposed in intimate contact with each other, without overlapping or separating, and bound with each other by hem stitching.
Claim 2
Dependent Claim
67 words
A heat pipe comprising a hollow wick impregnated with a liquid heat medium and an outer tubular cylinder accommodating said wick in a hermetically sealed condition, said wick including a ribbon-shaped material wound in the form of a helix, mutually adjacent lateral edges of said wick material being disposed in intimate contact with each other, without overlapping or separating, and bound with each other by hem stitching.
Claim 3
Dependent Claim
60 words
The heat pipe as defined in claim 1, wherein said wick material is formed as a netting with intersecting strands respectively extending in the longitudinal and transverse directions of said material, said strands being wound in both directions of said wick in the form of the helix, oriented with an inclination relative to the axial direction of the heat pipe.
Claim 4
Dependent Claim
18 words
The heat pipe as defined in claim 2, wherein the inclination of said strands is substntially substantially degress.
Claim 5
Independent Claim
76 words
A method of manufacturing a heat pipe, comprising the steps of forming a ribbon-shaped hollow wick in the form of a helix in such a manner that mutually adjacent lateral edges of the wick material are disposed in intimate contact with each other, without overlapping or separating, binding the lateral edges of the wick material with each other, hermetically sealing the wick within a tubular outer cylinder, and impregnating the wick with a liquid heat medium.
Claim 6
Independent Claim
76 words
A method of manufacturing a heat pipe, comprising the steps of forming a ribbon-shaped hollow wick in the form of a helix in such a manner that mutually adjacent lateral edges of the wick material are disposed in intimate contact with each other, without overlapping or separating, binding the lateral edges of the wick material with each other, hermetically sealing the wick within a tubular outer cylinder, and impregnating the wick with a liquid heat medium.
Claim 7
Dependent Claim
45 words
The method as defined in claim 4, wherein said forming step includes the steps of winding the ribbon-shaped wick helically around a mandrel of a diameter close to the prescribed inner diameter of the hollow wick, and extracting the mandrel from the wound wick material.
Claim 8
Dependent Claim
56 words
The method as defined in claim 4, further comprising the step of applying a force to the wick in the outer cylinder in an axial direction thereof, thereby to cause the diameter of the wick to expand, and to cause the outer surface of the wick to contact intimately the inner wall surface of the cylinder.
Claim 9
Dependent Claim
58 words
The method as defined in claim 4, further comprising the step of expanding the wick in the outer cylinder so as to contact intimately the inner wall surface of the cylinder, by forcibly passing a sphere through the hollow interior of the wick, the sphere having a diameter slightly larger than the inner diameter of the hollow wick.
References Cited (Backward Citations)
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US3686040A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |