Patent US3708419A successfully refreshed from Google Patents.
US3708419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cycling fluid heater
Assignee: National Aeronautics and Space Administration
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Filing: 1970-11-06
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Granted: 1973-01-02
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Expires: 1990-11-06
Abstract
Abstract The specification discloses a self-cycling fluid heater including a high temperature upstream preheater for elevating the stream temperature, a high intensity jet arc heater which heats the preheated fluid stream to ultra high reaction temperatures and discharges said stream into an electric resistance tubular heat exchanger having variations in wall thickness at measured intervals along its length to precisely control the temperature of the fluid passing through such heat exchanger for desired time intervals to provide the specified chemical reactions desired.
Inventors
- 👤 G Low
- 👤 W Moen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:26
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/0027; F24H1/0045; F24H1/10; F24H1/101
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
19 words
The invention of claim 1 wherein said preheater and said downstream reaction heat exchanger comprise tubular electrical resistance heaters.
Claim 2
Dependent Claim
30 words
The invention of claim 2 wherein said tubular electrical resistance heaters are provided with walls whose thickness varies according to the temperature desired in each portion of the tubular heater.
Claim 3
Dependent Claim
32 words
The invention of claim 2 in which the length of the various portions of the tube of a given wall thickness varies according to the resident time of the liquid flowing therethrough.
Claim 4
Dependent Claim
28 words
The invention of claim 2 wherein said tubular electric resistance pre-heater is coiled around said inlet chamber and said downstream control heat exchanger coiled around said discharge chamber.
Claim 5
Dependent Claim
24 words
The invention of claim 1 including a restricted throat in said fluid inlet chamber for increasing the velocity of liquid entering said reaction chamber.
Claim 6
Dependent Claim
42 words
The invention of claim 1 including conduit means extending radially outwardly from adjacent said reaction chamber to the exterior of said refractory body and means for injecting fluid into said conduit means for removing particles of the electrodes from said fluid stream.
Claim 7
Dependent Claim
25 words
The invention of claim 7 wherein said high temperature refractory body is surrounded by annular chambers and said conduit means communicates with said annular chambers.
Claim 8
Dependent Claim
50 words
The invention of claim 7 including a pair of concentric annular chambers around said body, with said conduit means connecting the innermost of said annular chambers with said reaction chamber; passages connecting the inner and outer annular chambers; and exhaust means in said outer annular chamber for discharging fluid therefrom.
Claim 9
Dependent Claim
35 words
The invention of claim 1 including port means in said refractory body adjacent said reaction chamber for injecting catalyst into said reaction chamber for mixture with liquids entering said reaction chamber from said inlet chamber.
Claim 10
Dependent Claim
20 words
The invention of claim 1 wHerein the electrodes are truncated cones aligned side by side to provide maximum linear contact.
Claim 11
Dependent Claim
36 words
The invention of claim 1 wherein said electrodes comprise flat plates which are stacked one on top the other with insulating means therebetween and which are operated by alternating current to provide a long electrode arc.
Claim 12
Dependent Claim
22 words
The invention of claim 1 wherein said electrodes have rounded sides and are arranged side by side to provide a linear arc.
Claim 13
Dependent Claim
14 words
The invention of claim 1 wherein said refractory body is formed of aluminum oxide.
Claim 14
Dependent Claim
31 words
The invention of claim 1 wherein said refractory body comprises a material suitable for combustion as an element in the desired chemical reaction and which is expendable in the chemical reaction.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |