Patent US3737281A successfully refreshed from Google Patents.
US3737281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel mixing shroud for heating torches
Assignee: Individual
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Filing: 1971-09-27
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Granted: 1973-06-05
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Expires: 1991-09-27
Abstract
Abstract A shroud for a fuel burning torch deformated to form a fluted configuration tapering outwardly from its fuel and air inlets to utilize air aspiration to draw fuel from a nozzle tip and to mix the air with expanding gases or liquids in a highly efficient manner to effect complete combustion.
Inventors
- 👤 C Guth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:24
CPC Classifications
F; F23; F23D; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0031
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
179 words
A fuel burner comprising: a main support element, a nozzle element on the main support element, said nozzle element being connected to an air gas supply and a fuel gas supply, a burner flame shroud mounted on said support element a predetermined distance therefrom for receiving air and gas from said nozzle element, said shroud comprising a fluted surface along a part only of its length and defining an inlet adjacent said support element diverging outwardly and terminating in an outlet, said fluted surface defining a plurality of U-shaped grooves on the inside of said shroud which form air passageways extending along the surface of the fluted portion of said shroud, said passageways exposing air passing therethrough to the temperature of the surface of the shroud before injecting it into the zone of fuel combustion in said shroud, a plurality of air scoop openings arranged along the fluted surface of said shroud, said air scoop openings defining secondary air passageways into said chamber for mixing with air and fuel gases in said shroud to aid combustion of said gases.
Claim 2
Dependent Claim
179 words
A fuel burner comprising: a main support element, a nozzle element on the main support element, said nozzle element being connected to an air gas supply and a fuel gas supply, a burner flame shroud mounted on said support element a predetermined distance therefrom for receiving air and gas from said nozzle element, said shroud comprising a fluted surface along a part only of its length and defining an inlet adjacent said support element diverging outwardly and terminating in an outlet, said fluted surface defining a plurality of U-shaped grooves on the inside of said shroud which form air passageways extending along the surface of the fluted portion of said shroud, said passageways exposing air passing therethrough to the temperature of the surface of the shroud before injecting it into the zone of fuel combustion in said shroud, a plurality of air scoop openings arranged along the fluted surface of said shroud, said air scoop openings defining secondary air passageways into said chamber for mixing with air and fuel gases in said shroud to aid combustion of said gases.
Claim 3
Dependent Claim
23 words
The fuel burner set forth in claim 1 wherein said air scoop openings form louvers directing the secondary air laterally into said shroud.
Claim 4
Dependent Claim
28 words
The fuel burner set forth in claim 1 wherein said shroud is formed of a continuous cylindrical configuration fluted at one end to form a tapered combustion chamber.
Claim 5
Dependent Claim
21 words
The fuel burner set forth in claim 1 wherein said air scoop openings are positioned along the surfaces of said grooves.
Claim 6
Dependent Claim
34 words
The fuel burner set forth in claim 4 wherein said air scoop openings are arranged to draw atmospheric air into said shroud by the effects of aspirating of the air passing through said passageways.
Claim 7
Dependent Claim
24 words
The fuel burner set forth in claim 4 wherein said air scoop openings are symmetrically arranged around and along the length of said shroud.
Claim 8
Dependent Claim
124 words
A fuel burner comprising: a main support element, a nozzle element on the main support element, said nozzle element being connected to an air gas supply and a fuel gas supply, a burner flame shroud mounted on said support element a predetermined distance therefrom for receiving air and gas from said nozzle element, said shroud comprising a fluted surface along a part only of its length and defining a venturi tube between its inlet and outlet, said fluted surface defining a plurality of U-shaped grooves on the inside of the fluted portion of said shroud which form air passageways exposing air passing therethrough to the temperature of the surface of the shroud before injecting it into the zone of fuel combustion in said shroud.
Claim 9
Dependent Claim
124 words
A fuel burner comprising: a main support element, a nozzle element on the main support element, said nozzle element being connected to an air gas supply and a fuel gas supply, a burner flame shroud mounted on said support element a predetermined distance therefrom for receiving air and gas from said nozzle element, said shroud comprising a fluted surface along a part only of its length and defining a venturi tube between its inlet and outlet, said fluted surface defining a plurality of U-shaped grooves on the inside of the fluted portion of said shroud which form air passageways exposing air passing therethrough to the temperature of the surface of the shroud before injecting it into the zone of fuel combustion in said shroud.
Claim 10
Dependent Claim
60 words
The fuel burner set forth in claim 7 wherein said shroud is provided with a plurality of air scoop openings arranged along at least a part of the fluted surface of said shroud, said air scoop openings defining secondary air passageways into said chamber for mixing with air and fuel gases in said shroud to aid combustion of said gases.
Claim 11
Dependent Claim
23 words
The fuel burner set forth in claim 8 wherein said air scoop openings are positioned in said shroud downstream from said venturi tube.
Claim 12
Dependent Claim
40 words
The fuel burner set forth in claim 8 wherein said air scoop openings are arranged symmetrically around and along said shroud to draw atmospheric air into said shroud by the aspirating effects of the air passing through said venturi tube.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |