US3792369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reactance controls for ac powered heating magnetrons
Assignee: Individual
•
Filing: 1972-09-13
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Granted: 1974-02-12
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Expires: 1992-09-13
Abstract
Abstract A variable reactance combined in series with a magnetron where, when said variable reactance is a variable capacitive reactance, means are provided for DC operation of said magnetron and AC operation of said capacitive reactance; where variable reactance can be a fixed reactance and variable reactance combination; and where said variable reactance provides the regulation required by said magnetron over normal voltage variations of an electric utility service.
Inventors
- 👤 M Levinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:20
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H03; H03B; H03B9/00; H03B9/01; H03B9/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
An operating circuit for a high-power heating magnetron which includes a magnetron; a variable reactance to vary the power output of said magnetron; means for an operator of said circuit to vary the reactance of said variable reactance; and means to connect said variable reactance and said magnetron to an alternating-voltage, electric utility service so that said magnetron discharges across said utility service during at least one voltage alternation of said utility service''s alternating voltage, where said improvement in said circuit comprises in combination: where said variable reactance is connected in series in the discharge circuit of said magnetron and, during said voltage alternation of said electric utility service in which said magnetron discharges, said magnetron blocks current flow to prevent a voltage drop across said variable reactance until said magnetron discharges and, when said magnetron discharges, said variable reactance limits the plate current of said magnetron to a value below said magnetron''s maximum allowable plate current notwithstanding normal variations in the voltage of said electric utility service.
Claim 2
Dependent Claim
168 words
An operating circuit for a high-power heating magnetron which includes a magnetron; a variable reactance to vary the power output of said magnetron; means for an operator of said circuit to vary the reactance of said variable reactance; and means to connect said variable reactance and said magnetron to an alternating-voltage, electric utility service so that said magnetron discharges across said utility service during at least one voltage alternation of said utility service''s alternating voltage, where said improvement in said circuit comprises in combination: where said variable reactance is connected in series in the discharge circuit of said magnetron and, during said voltage alternation of said electric utility service in which said magnetron discharges, said magnetron blocks current flow to prevent a voltage drop across said variable reactance until said magnetron discharges and, when said magnetron discharges, said variable reactance limits the plate current of said magnetron to a value below said magnetron''s maximum allowable plate current notwithstanding normal variations in the voltage of said electric utility service.
Claim 3
Dependent Claim
24 words
In an operating circuit according to claim 1 where said variable reactance is a combination of a fixed reactance 15 and a variable reactance.
Claim 4
Dependent Claim
22 words
In an operating circuit according to claim 2 where said fixed reactance is a capacitor and said variable reactance is an inductor.
Claim 5
Dependent Claim
22 words
In an operating circuit according to claim 2 where said fixed reactance is an inductor and said variable reactance is a capacitor.
Claim 6
Dependent Claim
43 words
In an operating circuit according to claim 1 where said variable reactance limits the change in said plate current of said magnetron, said plate current being maintained at a substantially constant current notwithstanding normal vaRiations in the voltage of said electric utility service.
Claim 7
Dependent Claim
58 words
In an operating circuit according to claim 1 which includes a disconnect switch and where said disconnect switch is ganged to said means for an operator to vary the reactance of said variable reactance to disconnect said magnetron at the lowest magnetron output position of said means for an operator to vary the reactance of said variable reactance.
Claim 8
Dependent Claim
61 words
In an operating circuit according to claim 1 where said variable reactance is a variable inductance, where the full voltage drop of said utility service appears across said magnetron up to its discharge voltage, and where voltages of said utility service which are higher than said magnetron''s discharge voltage divide in proper phase across said resistive magnetron and said variable inductance.
Claim 9
Dependent Claim
87 words
In an operating circuit according to claim 1 which includes a second magnetron connected across said first magnetron, the anode of said first magnetron connected to the cathode of said second magnetron and the cathode of said first magnetron connected to the anode of said second magnetron, where said first and second magnetrons conduct on alternate alternations of said alternating-voltage electric utility service and where both said magnetrons discharge in response to said service and vary their power output in response to variations in said variable reactance.
Claim 10
Dependent Claim
33 words
In an operating circuit according to claim 1, where said variable reactance is a variable air capacitance of at least two plates and where means are provided to mechanically move said plates apart.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |