US4360058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a surface of a metal wall for the transfer of heat
Assignee: Mahle Behr GmbH and Co KG
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Filing: 1980-05-12
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Granted: 1982-11-23
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Expires: 2000-05-12
Abstract
Abstract An improved metallic heat transfer surface for heat transfer during change of phase of a medium in contact therewith and method of making. A smooth metallic surface is lightly etched to form evaporation and/or condensation nuclei. The nuclei are defined by peaks and valleys in the material, the peaks substantially extending to the envelope of the surface prior to etching and the vallyes extending into said material not more than 10μ(1×10 -3 mm).
Inventors
- 👤 Herbert Muellejans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:10
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; C; C23; C23F; C23F1/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49353
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A heat-tube having contained for flow therein a medium which transports and transfers heat and which medium is vaporizable and condensable, said heat-tube having a first portion where the medium is vaporized by the application of heat and a second portion where the medium is condensed, and said heat-tube having an inner metallic wall effective for heat transfer, produced according to the process of providing a mechanically smooth surface of said metallic wall; and chemically etching said smooth surface to an extent that valleys at least with respect to the original smooth surface, are formed therein with peaks lying on the envelope of said original smooth surface, said peak-to-valley distance not exceeding 10μ.
Claim 2
Dependent Claim
113 words
A heat-tube having contained for flow therein a medium which transports and transfers heat and which medium is vaporizable and condensable, said heat-tube having a first portion where the medium is vaporized by the application of heat and a second portion where the medium is condensed, and said heat-tube having an inner metallic wall effective for heat transfer, produced according to the process of providing a mechanically smooth surface of said metallic wall; and chemically etching said smooth surface to an extent that valleys at least with respect to the original smooth surface, are formed therein with peaks lying on the envelope of said original smooth surface, said peak-to-valley distance not exceeding 10μ.
Claim 3
Dependent Claim
25 words
Heat-tube according to claim 1, wherein an external surface of said heat-tube is roughened by chemical etching and has a plurality of peaks and valleys.
Claim 4
Dependent Claim
29 words
Heat-tube according to claim 1 or 2, wherein the peak-to-valley depths R of surfaces roughened by chemical etching lie in the range of 1 to 10μ (1×10 -3 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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |