Patent US4199937A successfully refreshed from Google Patents.
US4199937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger and method of making
Assignee: National Aeronautics and Space Administration
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Filing: 1977-11-30
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Granted: 1980-04-29
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Expires: 1997-11-30
Abstract
Abstract A heat exchanger of increased effectiveness is disclosed. A porous metal matrix is disposed in a metal chamber or between walls through which a heat-transfer fluid is directed. The porous metal matrix has internal bonds and is bonded to the chamber in order to remove all thermal contact resistance within the composite structure. Utilization of the invention in a rocket chamber is disclosed as a specific use. Also disclosed is a method of constructing the heat exchanger.
Inventors
- 👤 Anthony Fortini
- 👤 John M. Kazaroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:09
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/42; F02K9/60; F02K9/62; F02K9/64; F28; F28F; F28F13/00; F28F13/003; F28F2255/00; F28F2255/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metallically bonded to said inner wall and wherein said porous media has a maximum cross-sectional area at the location of maximum heat flux.
Claim 2
Dependent Claim
75 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metallically bonded to said inner wall and wherein said porous media has a maximum cross-sectional area at the location of maximum heat flux.
Claim 3
Dependent Claim
29 words
The rocket chamber of claim 1 wherein the cross-sectional area of said porous metal media decreases in both an upstream and a downstream direction from the maximum cross-sectional area.
Claim 4
Dependent Claim
31 words
The rocket chamber of claim 2 wherein the decrease of cross-sectional area from said maximum is at a rate proportional to the decrease in temperature in respective upstream and downstream directions.
Claim 5
Dependent Claim
87 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metalically bonded to said inner wall and wherein the density of said porous metal media decreases both in an upstream and a downstream direction from a maximum density at the location of maximum heat flux.
Claim 6
Dependent Claim
87 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metalically bonded to said inner wall and wherein the density of said porous metal media decreases both in an upstream and a downstream direction from a maximum density at the location of maximum heat flux.
Claim 7
Dependent Claim
35 words
The rocket chamber of claim 4 wherein the decrease in density of said porous media from said maximum density is at a rate proportional to the decrease in temperature in respective upstream and downstream directions.
Claim 8
Dependent Claim
80 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metallically bonded to said inner wall and wherein said porous metal media has a maximum density and a maximum cross-sectional area at the location of maximum heat flux.
Claim 9
Dependent Claim
80 words
An improved rocket chamber of the type having longitudinally extending cooling channels defined by side walls and by the inner and outer rocket chamberwalls and through which there is directed a cooling medium, the improvement comprising a porous metal media disposed in at least one of said channels, said porous media being metallically bonded to said inner wall and wherein said porous metal media has a maximum density and a maximum cross-sectional area at the location of maximum heat flux.
Claim 10
Dependent Claim
34 words
The rocket chamber of claim 6 wherein said density and said cross-sectional area of said porous metal media decrease in both an upstream and a downstream direction from the location of maximum heat flux.
Claim 11
Dependent Claim
39 words
The rocket chamber of claim 7 wherein said density and said cross-sectional area of said porous metal media decrease at a rate proportional to a decrease in temperature in respective upstream and downstream directions from said maximum heat flux.
Claim 12
Dependent Claim
15 words
The rocket chamber of claim 8 wherein said porous metal media is a metal foam.
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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |