US4286365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: BASF Corp
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Filing: 1976-07-29
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Granted: 1981-09-01
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Expires: 1996-07-29
Abstract
Abstract A method of making a heat exchanger consisting of a conduit having a plurality of passes joined by integral return bends which comprises (i) bending two strips of material together in a zigzag manner to form a stack of substantially parallel passes, the two strips being displaced laterally with respect to one another, (ii) bonding the two strips together along lines substantially parallel to their longitudinal edges to form a flat, serpentine conduit, and (iii) inflating the conduit by applying internally a fluid under pressure.
Inventors
- 👤 Gordon R. Creighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:52
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; F; F28; F28F; F28F3/00; F28F3/12; F28F3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/49371
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A method of making a heat exchanger consisting of a conduit having a plurality of passes joined by integral return bends which consists essentially of, in sequence, (i) bending two strips of pliable material together in a zigzag manner to form a stack of parallel passes, the two strips being displaced laterally with respect to one another, (ii) bonding the two strips together along lines parallel to their longitudinal edges to form a flat, serpentine conduit, and (iii) inflating the conduit by applying internally a fluid under pressure.
Claim 2
Independent Claim
88 words
A method of making a heat exchanger consisting of a conduit having a plurality of passes joined by integral return bends which consists essentially of, in sequence, (i) bending two strips of pliable material together in a zigzag manner to form a stack of parallel passes, the two strips being displaced laterally with respect to one another, (ii) bonding the two strips together along lines parallel to their longitudinal edges to form a flat, serpentine conduit, and (iii) inflating the conduit by applying internally a fluid under pressure.
Claim 3
Dependent Claim
12 words
Method according to claim 1, in which the strips are of metal.
Claim 4
Dependent Claim
15 words
Method according to claim 2, in which the strips are of aluminum or aluminium alloy.
Claim 5
Dependent Claim
16 words
Method according to claim 1, in which the strips are from 0.01 to 0.8 mm thick.
Claim 6
Dependent Claim
15 words
Method according to claim 1, in which the passes in the inflated conduit are parallel.
Claim 7
Dependent Claim
65 words
Method according to claim 1, in which the two strips are displaced laterally with respect to one another by being (a) folded together and then pulled apart in the direction at right angles to the height of the stack, or (b) folded separately to the same dimensions and fitted together so that the folds almost coincide, or (c) folded together in the required displaced configuration.
Claim 8
Dependent Claim
20 words
Method according to claim 1, in which the longitudinal edges of the strips are bonded by means of an adhesive.
Claim 9
Dependent Claim
15 words
Method according to claim 7, in which the adhesive is a thermosetting resin adhesive composition.
Claim 10
Dependent Claim
21 words
Method according to claim 2, in which the longitudinal edges of the metallic strips are bonded by welding, soldering, or brazing.
Claim 11
Dependent Claim
40 words
Methods according to claim 1, in which packing pieces, each twice the thickness of the strips, are inserted between each pair of passes in the return bends and pressure is applied to assist the bonding of the two strips together.
Claim 12
Dependent Claim
15 words
Method according to claim 1, in which the conduit has two or more separate channels.
Claim 13
Dependent Claim
15 words
Method according to claim 1, in which the conduit has two or more interconnecting channels.
Claim 14
Dependent Claim
34 words
Method according to claim 1, in which shaped tool pieces are inserted between layers of conduit, and the stack is constrained within a frame and fitted between tie bars before the conduit is inflated.
Claim 15
Dependent Claim
19 words
Method according to claim 1, in which finning pieces are inserted between passes of conduit before or after inflation.
Claim 16
Dependent Claim
17 words
Method according to any of claim 1, in which the heat exchanger is provided with a coating.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |