US3662737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic heater
Assignee: Nupar Manufacturing Co Inc
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Filing: 1970-06-29
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Granted: 1972-05-16
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Expires: 1990-06-29
Abstract
Abstract A catalytic heater having a catalytic bed connected to a frame, incorporates an improved ignition and fuel shutoff system. A needle valve controlling the discharge of fuel onto the catalytic bed for oxidation includes a thermosensitive needle which is preheated by a pilot light. Upon reaching a predetermined temperature, the thermosensitive needle disengages its valve seat to allow fuel from the fuel supply to discharge onto the catalytic bed where oxidation thereof occurs. Upon cooling of the catalytic bed the thermosensitive needle resets to abrogate the discharge of fuel onto the catalytic bed and thereby prevent leakage of fuel.
Inventors
- 👤 Joe M Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:25
CPC Classifications
F; F23; F23C; F23C13/00; F23C13/02; F23D; F23D14/00; F23D14/12; F23D14/18; F23D14/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A catalytic heater for producing flameless heat including safety shut-off means, comprising: a fuel supply; a planar catalytic bed having a non-combustible support carrier and a catalytic agent thereon, the catalytic bed having a forward and a rearward surface and having a small diameter opening therein; a valve having an inlet port fluidly interconnected to said fuel supply and to an outlet port; a needle valve having an inlet port fluidly communicating with the outlet port of said metering valve and an outlet port adapted to discharge fuel on to said catalytic bed rearwArd surface; a valve needle slidably received in said opening in said catalytic bed and seatable in the outlet port of said needle valve; spring means normally urging said needle valve to the closed position; and a thermosensitive element supported adjacent the catalytic bed forward surface and interconnected to said valve needle, said thermosensitive element being positioned so as to be responsive to heat radiating from said catalytic bed forward surface whereby upon heat radiating from said bed forward surface said thermosensitive element disengages said valve needle from said outlet port of said valve, and in the absense of said heat, said spring moves said valve needle to seat in said needle valve to shut off fuel flow therethrough.
Claim 2
Dependent Claim
212 words
A catalytic heater for producing flameless heat including safety shut-off means, comprising: a fuel supply; a planar catalytic bed having a non-combustible support carrier and a catalytic agent thereon, the catalytic bed having a forward and a rearward surface and having a small diameter opening therein; a valve having an inlet port fluidly interconnected to said fuel supply and to an outlet port; a needle valve having an inlet port fluidly communicating with the outlet port of said metering valve and an outlet port adapted to discharge fuel on to said catalytic bed rearwArd surface; a valve needle slidably received in said opening in said catalytic bed and seatable in the outlet port of said needle valve; spring means normally urging said needle valve to the closed position; and a thermosensitive element supported adjacent the catalytic bed forward surface and interconnected to said valve needle, said thermosensitive element being positioned so as to be responsive to heat radiating from said catalytic bed forward surface whereby upon heat radiating from said bed forward surface said thermosensitive element disengages said valve needle from said outlet port of said valve, and in the absense of said heat, said spring moves said valve needle to seat in said needle valve to shut off fuel flow therethrough.
Claim 3
Dependent Claim
74 words
A catalytic heater as in claim 1 including a frame member supporting said catalytic bed, said frame including an upstanding portion bordered at the lower end thereof by horizontal members, said upstanding portion adaptable to carry said fuel supply in the form of a pressurized reservoir, and including horizontal members containing therein at least one spare fuel reservoir said spare reservoir serving as a stabilizer to reduce the possibility of tippage of said heater.
Claim 4
Dependent Claim
38 words
An apparatus as in claim 1 including an ignition means for preheating said catalytic bed and thermosensitive element whereby said valve needle disengages said valve outlet port to permit discharging of fuel onto said catalytic bed for oxidation.
Claim 5
Dependent Claim
50 words
An apparatus as in claim 3 wherein said ignition means comprises: a pilot valve having an inlet port fluidly interconnected to said fuel supply and an outlet port; and a pilot nozzle fluidly communicating with said pilot valve and positioned adjacent said catalytic bed forward surface and said thermosensitive element.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |