Patent US3869593A successfully refreshed from Google Patents.
US3869593A
Expired / Lapsed
US
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Heating device
Assignee: British Titan Ltd
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Filing: 1972-11-21
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Granted: 1975-03-04
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Expires: 1992-11-21
Abstract
Abstract A heating device including a pair of spaced electrodes one of which is hollow and has an outlet for a gas, an intermediate hollow electrode positioned between the principal electrodes, a control circuit including a control switch and a current sensing device connected between one of the principal electrodes and the intermediate electrode such that the current flow sensing device provides an indication of the current flowing between the principal electrodes and the intermediate electrode including a control switch and a current sensing device, an operating switch to render the control switch non-conducting and gas inlet means located between the principal electrodes and the intermediate electrode.
Inventors
- 👤 George William New
- 👤 Alan Lawrence Hare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:50
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/18; H05B7/185; H05B7/005
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
161 words
A heating device comprising a pair of axially spaced principal electrodes, at least one of which is hollow and has an outlet for a gas; said principal electrodes being connected to a high energy electric current; an intermediate hollow electrode located between said pair of principal electrodes and electrically insulated therefrom; a control circuit comprising a control switch and a current flow sensing device connected between one of said principal electrodes and said intermediate electrode such that said current flow sensing device senses the current flowing between one of said principal electrodes and said intermediate electrode; an operating switch electrically connected to said control switch anD operable to render said control switch nonconductive when the current between one of said principal electrodes and said intermediate electrode is sensed to have fallen below a predetermined value; gas inlet means disposed between each of said principal electrodes and said intermediate electrodes for introducing gas into said hollow intermediate and said hollow principal electrodes.
Claim 2
Dependent Claim
161 words
A heating device comprising a pair of axially spaced principal electrodes, at least one of which is hollow and has an outlet for a gas; said principal electrodes being connected to a high energy electric current; an intermediate hollow electrode located between said pair of principal electrodes and electrically insulated therefrom; a control circuit comprising a control switch and a current flow sensing device connected between one of said principal electrodes and said intermediate electrode such that said current flow sensing device senses the current flowing between one of said principal electrodes and said intermediate electrode; an operating switch electrically connected to said control switch anD operable to render said control switch nonconductive when the current between one of said principal electrodes and said intermediate electrode is sensed to have fallen below a predetermined value; gas inlet means disposed between each of said principal electrodes and said intermediate electrodes for introducing gas into said hollow intermediate and said hollow principal electrodes.
Claim 3
Dependent Claim
17 words
A heating device according to claim 1 in which the control switch is a silicon controlled rectifier.
Claim 4
Dependent Claim
21 words
A heating device according to claim 1 in which the operating switch is a liquid mercury switch operable by a solenoid.
Claim 5
Dependent Claim
40 words
A heating device according to claim 2 in which the control circuit includes a limiter device to prevent damage to the silicon controlled rectifier, as a result of too high a rate of current increase upon activation of the device.
Claim 6
Dependent Claim
27 words
A heating device according to claim 4 in which the limiter device is a choke of suitable size for the electrical characteristics of the silicon controlled rectifier.
Claim 7
Dependent Claim
24 words
A heating device according to claim 2 in which a voltage suppression circuit is provided across the silicon controlled rectifier in the control circuit.
Claim 8
Dependent Claim
18 words
A heating device according to claim 1 in which said hollow principal electrode is open at both ends.
Claim 9
Dependent Claim
27 words
A heating device according to claim 7 in which said hollow principal electrode has a bore of increasing internal diameter from the end adjacent the intermediate electrode.
Claim 10
Dependent Claim
28 words
A heating device according to claim 8 in which the inner surface of said hollow electrode is conical and has a cone angle of from 1* to 30*.
Claim 11
Dependent Claim
17 words
A heating device according to claim 9 in which said cone angle is from 2* to 20*.
Claim 12
Dependent Claim
35 words
A heating device according to claim 8 in which a field coil is positioned around said hollow principal electrode to provide a peak magnetic flux density of from 0.01 to 4.0 tesla when in operation.
Claim 13
Dependent Claim
30 words
A heating device according to claim 11 in which said field coil is such as to provide a peak magnetic flux density of 0.05 to 1.0 tesla when in operation.
Claim 14
Dependent Claim
26 words
A heating device according to claim 1 in which the other principal electrode is hollow and has a closed distal end opposite the hollow intermediate electrode.
Claim 15
Dependent Claim
31 words
A heating device according to claim 13 in which said other principal electrode has a field coil around the electrode to generate a magnetic field within the electrode when in use.
Claim 16
Dependent Claim
18 words
A heating device according to claim 1 wherein means are provided to cool the electrodes when in use.
Claim 17
Dependent Claim
31 words
A heating device according to claim 1 in which the gas inlet means are shaped and/or positioned to provide a tangential or helical gas flow through the device when in use.
Claim 18
Dependent Claim
32 words
A heating device according to claim 1 having a power source sufficient to provide a high energy electric current of from 100 to 20,000 volts and from 10 amps to 5,000 amps.
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |