Patent US3918878A successfully refreshed from Google Patents.
US3918878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of ignition for combustible gases
Assignee: Chemotronics International Inc
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Filing: 1973-08-17
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Granted: 1975-11-11
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Expires: 1993-08-17
Abstract
Abstract A method and apparatus is described for igniting combustible gases by the zone heating of a pressure resistant, electrically conductive material with spaced apart electrical contacts on a surface of the material opposite the gases. After the ignition of the gases, the heated zone cools or is cooled and additional combustible gases can then be reintroduced for ignition by the same method. The material is preferably in the form of a small diameter metal tube with a portion of its length being electrically heated. The apparatus and method are particularly useful in the deburring of articles by controlling the ignition of the explosive gases in a rapidly and repetitively opened and sealed chamber for deburring articles by causing ignition of the gases in the sealed chamber at only that operator-selected portion of the cycle after maximum desired unexploded gas charge pressure has been obtained.
Inventors
- 👤 Warren A Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:39
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/06; F23Q7/10; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
THE METHOD OF IGNITING A COMBUSTIBLE GAS TO PRODUCE A RAPID THERMAL ENERGY RELEASE AND PRESSURE RISE WHICH COMPRISES: A. PROVIDING AN IGNITABLE GAS ADJACENT TO AND ON ONE SIDE OF AN ELECTRICALLY CONDUCTIVE INGNITER MATERIAL HAVING SUFFICIENT MECHINICAL STRENGTH WHEN HEATED TO WITHSTAND A RAPID TERMAL ENERGY RELEASE AND PRESSURE RISE IN THE GAS ADJACENT TO THE IGNITER MATERIAL AND HAVING SUFFICIENT SURFACE ON THE SIDE OPPOSITE THE GAS TO PERMIT COOLING: B. HEATING THE IGNITER MATERIAL BY PASSING AN ELECTRIC CURRENT THROUGH THE MATERIAL SUCH THAT A ZONE BETWEEN SPACED APART ELECTRICALLY CONDUCTIVE LOW RESISTANCE LEADS CON-
Claim 2
Independent Claim
99 words
THE METHOD OF IGNITING A COMBUSTIBLE GAS TO PRODUCE A RAPID THERMAL ENERGY RELEASE AND PRESSURE RISE WHICH COMPRISES: A. PROVIDING AN IGNITABLE GAS ADJACENT TO AND ON ONE SIDE OF AN ELECTRICALLY CONDUCTIVE INGNITER MATERIAL HAVING SUFFICIENT MECHINICAL STRENGTH WHEN HEATED TO WITHSTAND A RAPID TERMAL ENERGY RELEASE AND PRESSURE RISE IN THE GAS ADJACENT TO THE IGNITER MATERIAL AND HAVING SUFFICIENT SURFACE ON THE SIDE OPPOSITE THE GAS TO PERMIT COOLING: B. HEATING THE IGNITER MATERIAL BY PASSING AN ELECTRIC CURRENT THROUGH THE MATERIAL SUCH THAT A ZONE BETWEEN SPACED APART ELECTRICALLY CONDUCTIVE LOW RESISTANCE LEADS CON-
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the conductive leads are moved into and out of contact with the igniter material.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the combustible gas is provided in contact with the igniter material inside a sealed chamber.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein heat transfer means is forced air in contact with the igniter material on the side opposite the gas side of the surface.
Claim 6
Dependent Claim
218 words
The igniter apparatus adapted to be fitted on a combustible gas containing chamber to produce ignition of the gas with a consequent rapid thermal energy release and pressure rise which comprises: a. an integral heatable electrically conductive igniter material provided with means adapted to be fitted to a gas ignition chamber and being of sufficient mechanical strength to be able to withstand a rapid thermal energy release and pressure rise in a gas on one side of the material and with a surface permitting cooling heat transfer on the side opposite the combustible gas side of the material; b. electrically conductive low resistance leads connected to the igniter material to form a conductive path between the leads through the material such that a zone of the heatable igniter material between the leads is heated to produce ignition on the combustible gas side of the material when the leads are supplied from a current source; and c. heat transfer means mounted adjacent to the surface opposite the combustible gas side of the material and in thermal contact with the heated zone of the igniter material for cooling the heated zone to below the ignition temperature of the combustible gas by removing the heat after the thermal energy release and pressure rise in the combustible gas in the chamber occurs.
Claim 7
Dependent Claim
218 words
The igniter apparatus adapted to be fitted on a combustible gas containing chamber to produce ignition of the gas with a consequent rapid thermal energy release and pressure rise which comprises: a. an integral heatable electrically conductive igniter material provided with means adapted to be fitted to a gas ignition chamber and being of sufficient mechanical strength to be able to withstand a rapid thermal energy release and pressure rise in a gas on one side of the material and with a surface permitting cooling heat transfer on the side opposite the combustible gas side of the material; b. electrically conductive low resistance leads connected to the igniter material to form a conductive path between the leads through the material such that a zone of the heatable igniter material between the leads is heated to produce ignition on the combustible gas side of the material when the leads are supplied from a current source; and c. heat transfer means mounted adjacent to the surface opposite the combustible gas side of the material and in thermal contact with the heated zone of the igniter material for cooling the heated zone to below the ignition temperature of the combustible gas by removing the heat after the thermal energy release and pressure rise in the combustible gas in the chamber occurs.
Claim 8
Dependent Claim
77 words
The apparatus of claim 5 wherein the igniter material is in the form of a tube with sides extending from the means adapted to be fitted to the chamber to a closed end and an open end at the end with the means adapted to be fitted to the chamber and wherein the leads are connected to the exterior sides of the tube opposite the gas combustion side of the igniter material to provide the heatable zones.
Claim 9
Dependent Claim
20 words
The apparatus of claim 5 wherein the heated zone of the igniter material is adapted to fit inside the chamber.
Claim 10
Dependent Claim
15 words
The apparatus of claim 5 wherein the electrically conductive leads are provided with fluid cooling.
Claim 11
Dependent Claim
19 words
The apparatus of claim 5 wherein the heat transfer means is air cooled surfaces mounted adjacent the heated zone.
Claim 12
Dependent Claim
27 words
The apparatus of claim 9 wherein the air cooled surfaces are electrically conductive and the leads are connected to the ignition means surface through the cooled surfaces.
Claim 13
Dependent Claim
24 words
The apparatus of claim 5 wherein a current source is connected to the leads and wherein the igniter material is fitted to the chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |