US3906604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming heat transmissive wall surface
Assignee: Hitachi Cable Ltd
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Filing: 1974-02-01
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Granted: 1975-09-23
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Expires: 1994-02-01
Abstract
Abstract A plurality of extremely fine grooves are formed on one side of a heat transmissive wall, and there are also provided a plurality of fine second grooves which are substantially parallel and closely adjacent to each other and which cross the first-said grooves. Fine notched ribs are formed between said second grooves, with the end portions thereof being rubbed and stretched transversely and connected to the adjoining ribs.
Inventors
- 👤 Kimio Kakizaki
- 👤 Takashi Suzumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:17
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; B; B21; B21C; B21C37/00; B21C37/02; B23; B23P; B23P15/00; B23P15/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method of forming a heat transmissive wall surface comprising the steps of forming a plurality of fine first grooves on one side of a heat transmissive wall, while forming a plurality of fine second grooves which cross said first grooves and which are substantially parallel and closely adjacent to each other, then frictionally heating by rubbing and stretching transversely the ends of the small notched ribs formed between said second grooves and fusingly connecting said ends to the adjoining ribs.
Claim 2
Independent Claim
81 words
A method of forming a heat transmissive wall surface comprising the steps of forming a plurality of fine first grooves on one side of a heat transmissive wall, while forming a plurality of fine second grooves which cross said first grooves and which are substantially parallel and closely adjacent to each other, then frictionally heating by rubbing and stretching transversely the ends of the small notched ribs formed between said second grooves and fusingly connecting said ends to the adjoining ribs.
Claim 3
Dependent Claim
27 words
The method according to claim 1, in which the respective grooves are formed by rolling, and frictional rubbing of the rib ends is accomplished by wire brushing.
Claim 4
Dependent Claim
27 words
The method according to claim 1, in which said respective grooves are formed by cutting, and frictional rubbing of the rib endS is accomplished by wire brushing.
Claim 5
Dependent Claim
33 words
The method according to claim 1, in which the first grooves are formed by rolling and the second grooves by cutting, and frictional rubbing of the rib ends is accomplished by wire brushing.
Claim 6
Dependent Claim
15 words
The method according to claim 2, in which the first grooves are formed by knurling.
Claim 7
Dependent Claim
28 words
The method according to claim 3, in which the second grooves are formed by a cutting method which does not cut off the wall surface but deforms it.
Claim 8
Dependent Claim
28 words
The method according to claim 4, in which the second grooves are formed by a cutting method which does not cut off the wall surface but deforms it.
Claim 9
Dependent Claim
28 words
The method according to claim 5, in which the second grooves are formed by a cutting method which does not cut off the wall surface but deforms it.
Claim 10
Dependent Claim
47 words
The method according to claim 1, in which continuously extending cavities are formed within the surface by said step of fusingly connecting said ends of the ribs between said second grooves, said cavities communicating with the exterior of the surface by through-holes formed by said first grooves.
Claim 11
Dependent Claim
24 words
The method according to claim 9, in which said second grooves have a depth equal to or greater than that of said first grooves.
Claim 12
Dependent Claim
36 words
The method according to claim 9, in which said cavities effect flow of a liquid therein from respective lower through-holes to respective upper through-holes, thereby enhancing heat exchange from the heat transmissive wall to said liquid.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |