US4601089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of heat-exchanger elements of strip-finned heat-exchangers
Assignee: Individual
•
Filing: 1984-12-31
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Granted: 1986-07-22
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Expires: 2004-12-31
Abstract
Abstract In a finned heat exchanger, preferably of aluminum, the feed of the fins (1) are secured to tubular passages (3, 3a, 3b) formed from plates (2) that have been rolled together and then expanded. The bond between the fins (1) and the plates (2) may be an adhesive bond, as by welding or a cohesive bond, as by tight pressing together.
Inventors
- 👤 Pal Gal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:57
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/49371; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A process for making a heat exchanger of aluminum, comprising: applying a pattern of stop weld material to a first plate element; superimposing a second element on the first plate element and hot-rolling the plate elements together to form a plate; expanding the sides of the plate that are protected by the stop weld material by the application of fluid pressure to form a plurality of tubular heat exchanger medium flow passages; securing a plurality of fins by direct weld, without the use of foreign materials, at only one of their ends to the plate; holding a plurality of the plates in a frame; and securing the other end of each fin to the other part of a plate by applying additional fluid pressure with the tubular passages of sufficient magnitude to cause permanent deformation and metal-to-metal cohesive bonding between the other end and the surface of the plate.
Claim 2
Dependent Claim
149 words
A process for making a heat exchanger of aluminum, comprising: applying a pattern of stop weld material to a first plate element; superimposing a second element on the first plate element and hot-rolling the plate elements together to form a plate; expanding the sides of the plate that are protected by the stop weld material by the application of fluid pressure to form a plurality of tubular heat exchanger medium flow passages; securing a plurality of fins by direct weld, without the use of foreign materials, at only one of their ends to the plate; holding a plurality of the plates in a frame; and securing the other end of each fin to the other part of a plate by applying additional fluid pressure with the tubular passages of sufficient magnitude to cause permanent deformation and metal-to-metal cohesive bonding between the other end and the surface of the plate.
References Cited (Backward Citations)
CA705782A
Cited
DE665128C
Cited
US2195259A
Cited
US2657018A
Cited
US3205560A
Cited
US3205563A
Cited
GB813589A
Cited
DE1452883A1
Cited
US3712372A
Cited
US4304821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |