US3719173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanging apparatus
Assignee: Individual
•
Filing: 1971-10-12
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Granted: 1973-03-06
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Expires: 1991-10-12
Abstract
Abstract A heat exchanger assembly consisting of a housing and a combustion chamber and ducts provided in the housing for a fluid or gas medium which is to be heated is disclosed. The assembly consists of a central combustion chamber, and two or more arcuately-shaped shell sections enclosing the central combustion chamber and defining the ducts. One of the shell sections has inwardly directed flanges secured to walls of the central combustion chamber with edges of the remaining shell sections being secured to walls of the other of the shell sections, and the flanges are provided with apertures to provide communication between the ducts formed.
Inventors
- 👤 H Viessmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:02
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F24H1/285
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A heat exchanger assembly consisting of a housing and a combustion chamber and ducts provided in the housing for a fluid or gas medium which is to be heated, comprising a central combustion chamber, and at least two arcuately-shaped shell sections enclosing the said central combustion chamber and defining said ducts, one of the said shell sections having inwardly directed flanges secured to walls of the central combustion chamber, with edges of the remaining shell sections being secured to walls of the said one of the said shell sections, the said flanges having apertures to provide communication between said ducts.
Claim 2
Dependent Claim
100 words
A heat exchanger assembly consisting of a housing and a combustion chamber and ducts provided in the housing for a fluid or gas medium which is to be heated, comprising a central combustion chamber, and at least two arcuately-shaped shell sections enclosing the said central combustion chamber and defining said ducts, one of the said shell sections having inwardly directed flanges secured to walls of the central combustion chamber, with edges of the remaining shell sections being secured to walls of the said one of the said shell sections, the said flanges having apertures to provide communication between said ducts.
Claim 3
Dependent Claim
100 words
A heat exchanger assembly consisting of a housing and a combustion chamber and ducts provided in the housing for a fluid or gas medium which is to be heated, comprising a central combustion chamber, and at least two arcuately-shaped shell sections enclosing the said central combustion chamber and defining said ducts, one of the said shell sections having inwardly directed flanges secured to walls of the central combustion chamber, with edges of the remaining shell sections being secured to walls of the said one of the said shell sections, the said flanges having apertures to provide communication between said ducts.
Claim 4
Dependent Claim
100 words
A heat exchanger assembly consisting of a housing and a combustion chamber and ducts provided in the housing for a fluid or gas medium which is to be heated, comprising a central combustion chamber, and at least two arcuately-shaped shell sections enclosing the said central combustion chamber and defining said ducts, one of the said shell sections having inwardly directed flanges secured to walls of the central combustion chamber, with edges of the remaining shell sections being secured to walls of the said one of the said shell sections, the said flanges having apertures to provide communication between said ducts.
Claim 5
Dependent Claim
62 words
A heat exchanger assembly according to claim 1 consisting of four sections enclosing the central combustion chamber, two opposed shell sections having inwardly directed flanges secured to walls of the combustion chamber, edges of the other two shell sections being secured to walls of the said two opposed shell sections to provide fluid or gas ducts completely enclosing the central combustion chamber.
Claim 6
Dependent Claim
28 words
A heat exchanger assembly according to claim 1 wherein the central combustion chamber is generally rectangular in cross-section, having two generally U-shaped shell sections in cross-section provided therearound.
Claim 7
Dependent Claim
26 words
A heat exchanger assembly according to claim 1 wherein the said shell sections are secured to the central combustion chamber and to each other by welding.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |