Patent US3812965A successfully refreshed from Google Patents.
Patent US4019853A successfully refreshed from Google Patents.
US4019853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic fuel ignition apparatus
Assignee: Unifrax I LLC
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Filing: 1975-11-03
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Granted: 1977-04-26
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Expires: 1995-11-03
Abstract
Abstract An apparatus for fluid fuel ignition which consists essentially of an igniter which reaches a temperature above the ignition temperature of the fuel when sufficient electricity from an electrical source passes through the igniter and which igniter remains continuously at a temperature above the ignition temperature of the fuel while the fuel passes through a fuel injection means proximate to the igniter. A thermal delay relay which activates a valve, which permits fuel to pass through the fuel injection means proximate the igniter, is responsive to current flow through the igniter after the igniter has reached ignition temperature. The apparatus requires no mechanical moving parts other than a thermostat, one electrical relay and a fuel valve responsive to an electrical signal. Only two sets of electrical contacts are required in the entire apparatus including the thermostat and internal relay contacts. The apparatus may be conveniently designed to operate at either low or high voltage. A low voltage thermostatic control may optionally be used in conjunction with a high voltage ignition which requires only one additional relay.
Inventors
- 👤 Arthur H. Sears
- 👤 August J. Siuta, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:16
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N2227/00; F23N2227/38
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
Apparatus for automatic fluid fuel ignition, comprising: a. an electrical resistance igniter means for igniting fluid fuel; b. fluid fuel supply means including a normally closed fluid fuel valve; c. fluid fuel flow means for flowing the fuel proximate the igniter means when the fluid fuel valve is open; and d. valve opening means comprising an electrically activated time delay relay, electrically connected in series to the igniter means, for opening the fluid fuel valve, sufficient electrical current to activate said relay passing through said relay only after the igniter means is at a temperature above the ignition temperature of the fluid fuel.
Claim 2
Dependent Claim
103 words
Apparatus for automatic fluid fuel ignition, comprising: a. an electrical resistance igniter means for igniting fluid fuel; b. fluid fuel supply means including a normally closed fluid fuel valve; c. fluid fuel flow means for flowing the fuel proximate the igniter means when the fluid fuel valve is open; and d. valve opening means comprising an electrically activated time delay relay, electrically connected in series to the igniter means, for opening the fluid fuel valve, sufficient electrical current to activate said relay passing through said relay only after the igniter means is at a temperature above the ignition temperature of the fluid fuel.
Claim 3
Dependent Claim
34 words
The apparatus as claimed in claim 1, wherein the time delay relay contains a normally open set of electrical contacts which are closable after time delay, responsive to electrical current passing through the relay.
Claim 4
Dependent Claim
29 words
The apparatus as claimed in claim 2, comprising in addition primary control means for causing electric current to flow through the igniter means and through the time delay relay.
Claim 5
Dependent Claim
23 words
The apparatus as claimed in claim 3, wherein the igniter means, time delay relay and primary control means are electrically connected in series.
Claim 6
Dependent Claim
28 words
The apparatus as claimed in claim 4, wherein the igniter means, time delay relay and primary control means are also electrically connected in series to an electrical source.
Claim 7
Independent Claim
252 words
An apparatus for automatic fuel ignition consisting essentially of: a. an igniter which reaches a temperature above the ignition temperature of the fuel when sufficient electrical current from an electrical source passes through the igniter; b. a time delay relay connected with the electrical source in series with the igniter, said time delay relay containing a normally open set of electrical contacts which are closed after a time delay when the relay is activated by an electrical current which flows from the electrical source through the relay and igniter, said electrical current being sufficient to activate said relay only after the igniter reaches a temperature above the ignition temperature of the fuel; c. a primary control means having a set of electrical contacts connected to the electrical source in series with the igniter and time delay relay, said primary control means causing said electrical current from the electrical source to flow through the igniter and time delay relay when said contacts in the primary control means are closed; and d. a normally closed fuel valve connected between a fuel supply and a fuel injection means, said valve being electrically connected to an electrical source in series with the contacts in the time delay relay, said fuel valve being electrically activated to its open position when the contacts in the time delay relay are closed, said fuel injection means being positioned to permit fuel passing through said fuel injection means to pass close enough to the igniter to cause said fuel to ignite.
Claim 8
Independent Claim
252 words
An apparatus for automatic fuel ignition consisting essentially of: a. an igniter which reaches a temperature above the ignition temperature of the fuel when sufficient electrical current from an electrical source passes through the igniter; b. a time delay relay connected with the electrical source in series with the igniter, said time delay relay containing a normally open set of electrical contacts which are closed after a time delay when the relay is activated by an electrical current which flows from the electrical source through the relay and igniter, said electrical current being sufficient to activate said relay only after the igniter reaches a temperature above the ignition temperature of the fuel; c. a primary control means having a set of electrical contacts connected to the electrical source in series with the igniter and time delay relay, said primary control means causing said electrical current from the electrical source to flow through the igniter and time delay relay when said contacts in the primary control means are closed; and d. a normally closed fuel valve connected between a fuel supply and a fuel injection means, said valve being electrically connected to an electrical source in series with the contacts in the time delay relay, said fuel valve being electrically activated to its open position when the contacts in the time delay relay are closed, said fuel injection means being positioned to permit fuel passing through said fuel injection means to pass close enough to the igniter to cause said fuel to ignite.
Claim 9
Dependent Claim
29 words
The apparatus as claimed in claim 6 wherein the electrical source to which the igniter and time delay relay are connected in series is a high voltage electrical source.
Claim 10
Dependent Claim
15 words
The apparatus as claimed in claim 7 wherein the primary control means is a thermostat.
Claim 11
Dependent Claim
21 words
The apparatus as claimed in claim 8 wherein the electrical source connected to the valve is a low voltage electrical source.
Claim 12
Dependent Claim
25 words
The apparatus as claimed in claim 8 wherein the electrical source connected to the valve is a high voltage electrical source connected with the igniter.
Claim 13
Dependent Claim
44 words
The apparatus as claimed in claim 9 wherein the electrical source connected to the valve is the secondary of a step-down transformer having its primary connected with a high voltage electrical source which is the same as the electrical source connected with the igniter.
Claim 14
Dependent Claim
26 words
The apparatus as claimed in claim 11 wherein the thermostat is connected in series with the high voltage electrical source and the primary of the transformer.
Claim 15
Dependent Claim
43 words
The apparatus as claimed in claim 7 wherein the electrical contacts in the primary control means are controlled by a relay coil which closes the contacts in the primary control means when the relay coil is activated by a low voltage electrical source.
Claim 16
Dependent Claim
24 words
The apparatus as claimed in claim 13 wherein a thermostat is connected in series with the relay coil to the low voltage electrical source.
Claim 17
Dependent Claim
45 words
The apparatus as claimed in claim 14 wherein the electrical source connected to the relay coil is the secondary of a step-down transformer having its primary connected with a high voltage electrical source which is the same as the electrical source connected with the igniter.
Claim 18
Dependent Claim
35 words
The apparatus as claimed in claim 15 wherein electrical source connected to the valve is a low voltage electrical source and is the same low voltage electrical source which is connected to the relay coil.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |