Patent US4194384A successfully refreshed from Google Patents.
US4194384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing heat-transfer wall for vapor condensation
Assignee: Hitachi Cable Ltd
•
Filing: 1978-06-08
•
Granted: 1980-03-25
•
Expires: 1998-06-08
Abstract
Abstract A method of manufacturing a heat-transfer wall for vapor condensation comprising the step of forming on the heat-transfer surface, a number of shallow grooves substantially in parallel at a fine pitch, and then forming, on the heat-transfer surface and in the direction across said shallow grooves, a number of grooves deeper than the shallow grooves at a fine pitch by cutting and turning up the heat-transfer surface in the plowing manner. Said method may further comprise a subsequent step of curling the edges of the ridges formed in the above-mentioned step into said deep grooves.
Inventors
- 👤 Kunio Fujie
- 👤 Wataru Nakayama
- 👤 Heikichi Kuwahara
- 👤 Takahiro Daikoku
- 👤 Kimio Kakizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:20
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21D; B21D31/00; B21J; B21J5/00; B21J5/06; B21J5/068; F; F28; F28F; F28F13/00; F28F13/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49385
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
191 words
A method of manufacturing a heat-transfer wall for vapor condensation in such a way that hot vapor is condensed by contact with the wall surface at a low temperature, the method comprising the steps of: (a) forming, on the heat-transfer surface, a number of shallow grooves substantially in parallel at a pitch of not more than one millimeter between the grooves; and (b) forming, on the heat-transfer surface and in the direction across said shallow grooves formed in the step (a), a number of grooves not more than two millimeters in depth and deeper than the grooves formed in the step (a) and also forming ridges severed by said deep grooves and not more than two millimeters in depth as measured from the bottoms of said deep grooves, each said ridge having a sharply tapered edge and a number of notches with sharp, tapering edges and inclined bottoms, by cutting and turning up the heat-transfer surface in the plowing manner, or by cutting at an angle to the surface to turn up the material upright, through the relative movement of said heat-transfer surface and/or the plowing tool across said shallow grooves.
Claim 2
Independent Claim
191 words
A method of manufacturing a heat-transfer wall for vapor condensation in such a way that hot vapor is condensed by contact with the wall surface at a low temperature, the method comprising the steps of: (a) forming, on the heat-transfer surface, a number of shallow grooves substantially in parallel at a pitch of not more than one millimeter between the grooves; and (b) forming, on the heat-transfer surface and in the direction across said shallow grooves formed in the step (a), a number of grooves not more than two millimeters in depth and deeper than the grooves formed in the step (a) and also forming ridges severed by said deep grooves and not more than two millimeters in depth as measured from the bottoms of said deep grooves, each said ridge having a sharply tapered edge and a number of notches with sharp, tapering edges and inclined bottoms, by cutting and turning up the heat-transfer surface in the plowing manner, or by cutting at an angle to the surface to turn up the material upright, through the relative movement of said heat-transfer surface and/or the plowing tool across said shallow grooves.
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein the shallow grooves formed in the step (a) and the deep grooves formed in the step (b) intersect at an angle of about 45°.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein said shallow grooves are formed in the step (a) by knurling.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein said shallow grooves are formed in the step (a) by a cutting tool.
Claim 6
Dependent Claim
24 words
A method according to claim 1, wherein said deep grooves and ridges are formed in the step (b) by a plurality of cutting tools.
Claim 7
Dependent Claim
63 words
A method according to claim 1, which further comprises in addition to the steps (a) and (b), a subsequent step (c) of curling the edges of the ridges formed in the step (b) toward and into said deep grooves while leaving the roots of said ridges upright relative to said heat-transfer surface, so that only the edges of the ridges are bent down.
Claim 8
Dependent Claim
28 words
A method according to claim 6, wherein said edges of said ridges are curled toward and into said deep grooves by means of a die having corresponding grooves.
Claim 9
Independent Claim
161 words
A method of manufacturing a heat-transfer wall for vapor condensation whereby hot vapor contacting a heat-transfer surface of the heat-transfer wall is condensed at a low temperature, the method comprising the steps of: (a) knurling, on the heat-transfer surface, a number of shallow, V-shaped grooves substantially in parallel to each other at a pitch of not more than one millimeter between the grooves; (b) cutting and turning up the grooved heat-transfer surface, thereby deforming the surface to form a plurality of grooves deeper than the shallow grooves in a direction across the shallow grooves, that is about 45° to the shallow grooves, to form raised ridges between said deep grooves each having a sharply tapering edge and to sever the shallow grooves into a multiplicity of notches located on the tapering edges of the ridges; the deep grooves and the raised ridges being not more than two millimeters in depth and said notches having sharp tapering edges and inclined bottom portions.
Claim 10
Independent Claim
161 words
A method of manufacturing a heat-transfer wall for vapor condensation whereby hot vapor contacting a heat-transfer surface of the heat-transfer wall is condensed at a low temperature, the method comprising the steps of: (a) knurling, on the heat-transfer surface, a number of shallow, V-shaped grooves substantially in parallel to each other at a pitch of not more than one millimeter between the grooves; (b) cutting and turning up the grooved heat-transfer surface, thereby deforming the surface to form a plurality of grooves deeper than the shallow grooves in a direction across the shallow grooves, that is about 45° to the shallow grooves, to form raised ridges between said deep grooves each having a sharply tapering edge and to sever the shallow grooves into a multiplicity of notches located on the tapering edges of the ridges; the deep grooves and the raised ridges being not more than two millimeters in depth and said notches having sharp tapering edges and inclined bottom portions.
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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |