US3958631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for catalytic gas converters
Assignee: Siemens AG
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Filing: 1973-12-10
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Granted: 1976-05-25
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Expires: 1993-12-10
Abstract
Abstract An improved heat exchanger for a catalytic gas converter, the heat exchanger being of the cross-flow type and comprised of several flow chambers separated from each other by heat exchanger surfaces having small wall thickness in which each flow chamber is sealed at each end with two plane parallel, warp-free sealing surfaces which face each other.
Inventors
- 👤 Hellmuth Mentschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:05
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F02; F02M; F02M27/00; F02M27/02; F28F21/00; F28F21/04; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10T; Y10T29/00; Y10T29/49; Y10T29/49345
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
In a crossflow heat exchanger having a plurality of flow chambers separated from each other by heat exchange surfaces with the heat exchange surfaces separated on opposite sides by spacers and having edges attached to said spacers to seal the chambers, the spacers having portions at areas where they abut the heat exchange surfaces which are surface sections parallel to and essentially of the same thickness as the heat exchange surfaces, the improvement comprising: a. spacers having a profile such as to present parallel surface sections having edges directed toward the outside of the chambers; and b. a gas tight welded seam welding the edges of each parallel surface section to the edge of a heat exchanger surface.
Claim 2
Dependent Claim
118 words
In a crossflow heat exchanger having a plurality of flow chambers separated from each other by heat exchange surfaces with the heat exchange surfaces separated on opposite sides by spacers and having edges attached to said spacers to seal the chambers, the spacers having portions at areas where they abut the heat exchange surfaces which are surface sections parallel to and essentially of the same thickness as the heat exchange surfaces, the improvement comprising: a. spacers having a profile such as to present parallel surface sections having edges directed toward the outside of the chambers; and b. a gas tight welded seam welding the edges of each parallel surface section to the edge of a heat exchanger surface.
Claim 3
Dependent Claim
21 words
A heat exchanger according to claim 1 wherein said heat exchanger surfaces and said spacers are made of the same material.
Claim 4
Dependent Claim
18 words
The invention according to claim 2 wherein the heat exchanger surfaces and the spacer consist of alloy steel.
Claim 5
Dependent Claim
34 words
The heat exchanger according to claim 1 and further including a plurality of half-round sections welded to the heat exchange surfaces with their longitudinal axis extending in the flow direction through the heat exchanger.
Claim 6
Dependent Claim
20 words
The invention according to claim 4 wherein said half-round sections have their convex sides attached to said heat exchange surfaces.
Claim 7
Dependent Claim
17 words
The invention according to claim 5 wherein said half-round sections are spot-welded to said heat exchanger surfaces.
Claim 8
Dependent Claim
22 words
The invention according to claim 5 wherein said half-round sections are welded to said heat exchanger surfaces in a continuous welded seam.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |