US4182412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned heat transfer tube with porous boiling surface and method for producing same
Assignee: Bank of Nova Scotia
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Filing: 1978-01-09
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Granted: 1980-01-08
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Expires: 1998-01-09
Abstract
Abstract The invention relates to finned heat transfer tubes and to a method for impoving the heat transfer properties in boiling liquids of such tubes by plating the tubes in an electroplating bath containing conductive particles such as graphite powder to produce a porous plated surface. The tips of the fins are covered before plating with a non-conductive coating to prevent plating of the tips. The non-conductive coating can be dissolved away or mechanically removed after plating.
Inventors
- 👤 Ming S. Shum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:52
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A metal finned tube having an improved boiling surface comprising a coating including an electroplated metal portion, said coating being on the side surface portions and root portions of its fins but with the metallic tip portions of its fins being devoid of said coating, the coating including a large number of powder-like conductive particles which are either completely encapsulated by the electroplated metal portion or completely encapsulated except for a point of contact between said conductive particles and the metal surface of the fins or tube, said conductive particles causing said coating to be textured.
Claim 2
Dependent Claim
96 words
A metal finned tube having an improved boiling surface comprising a coating including an electroplated metal portion, said coating being on the side surface portions and root portions of its fins but with the metallic tip portions of its fins being devoid of said coating, the coating including a large number of powder-like conductive particles which are either completely encapsulated by the electroplated metal portion or completely encapsulated except for a point of contact between said conductive particles and the metal surface of the fins or tube, said conductive particles causing said coating to be textured.
Claim 3
Dependent Claim
12 words
The finned tube of claim 1 wherein said conductive particles are graphite.
Claim 4
Dependent Claim
18 words
The finned tube of claim 2 wherein said graphite particles have a size no greater than 200 mesh.
Claim 5
Dependent Claim
14 words
The finned tube of claim 1 wherein said tube and plated coating comprise copper.
Claim 6
Dependent Claim
20 words
The finned tube of claim 1 wherein said plating has a density of about 36 g. per foot of length.
Claim 7
Dependent Claim
17 words
The finned tube of claim 1 wherein said tube has approximately 20 fins per inch of length.
References Cited (Backward Citations)
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US2455457A
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US2713997A
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US3884772A
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Cited
US4120994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |