Patent US3760291A successfully refreshed from Google Patents.
US3760291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for heating magnetron
Assignee: Individual
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Filing: 1971-11-26
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Granted: 1973-09-18
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Expires: 1991-11-26
Abstract
Abstract A power supply for varying the power output of a heating magnetron which includes a variable resistance in series with said magnetron and a source of power for said magnetron, and where the lowest resistance section of said variable resistance is designed to carry more current than the other resistance sections.
Inventors
- 👤 M Levinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:58
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/01; H03B9/10; H03L; H03L5/00; H03L5/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
A microwave oven power supply circuit comprising a source of high-voltage, low-current power and a magnetron discharging from said source of power, means to maintain said low-current at a substantially constant current notwithstanding normal variations in the voltage of said power source and an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure to permit control of said variable resistance by an operator of said oven, and where said low-current flowing through said magnetron flows through said variable resistance.
Claim 2
Dependent Claim
89 words
A microwave oven power supply circuit comprising a source of high-voltage, low-current power and a magnetron discharging from said source of power, means to maintain said low-current at a substantially constant current notwithstanding normal variations in the voltage of said power source and an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure to permit control of said variable resistance by an operator of said oven, and where said low-current flowing through said magnetron flows through said variable resistance.
Claim 3
Dependent Claim
34 words
In one circuit, according to claim 1, where said structure to permit manual control includes means to turn off the power output of said magnetron at the high resistance end of said variable resistance.
Claim 4
Dependent Claim
82 words
A microwave oven power supply circuit comprising a source of high-voltage, low-current power and a magnetron discharging from said source of power, an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure to permit control of said variable resistance, where said low-current flowing through said magnetron flows through said variable resistance, and where the low resistance section of said variable resistance is designed to handle more power than the other resistance sections.
Claim 5
Dependent Claim
82 words
A microwave oven power supply circuit comprising a source of high-voltage, low-current power and a magnetron discharging from said source of power, an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure to permit control of said variable resistance, where said low-current flowing through said magnetron flows through said variable resistance, and where the low resistance section of said variable resistance is designed to handle more power than the other resistance sections.
Claim 6
Dependent Claim
14 words
In one circuit, according to claim 3, where the variable resistance is a rheostat.
Claim 7
Dependent Claim
25 words
In one circuit, according to claim 4, where the moving arm of said rheostat is at ground potential and said magnetron has its anode grounded.
Claim 8
Dependent Claim
93 words
In one circuit of a microwave oven power supply circuit comprising a source of high-voltage, low-current power, a magnetron discharging from said power, and an improved rheostat for varying the power output of said magnetron, said improved rheostat comprising in combination: a low resistance section of said rheostat designed to handle more power than the other resistance sections, a ground connection to the moving contacting arm of said rheostat where said magnetron has one side of its cathode-plate circuit grounded, and where the plate current flowing through said magnetron flows through said rheostat.
Claim 9
Dependent Claim
93 words
In one circuit of a microwave oven power supply circuit comprising a source of high-voltage, low-current power, a magnetron discharging from said power, and an improved rheostat for varying the power output of said magnetron, said improved rheostat comprising in combination: a low resistance section of said rheostat designed to handle more power than the other resistance sections, a ground connection to the moving contacting arm of said rheostat where said magnetron has one side of its cathode-plate circuit grounded, and where the plate current flowing through said magnetron flows through said rheostat.
Claim 10
Dependent Claim
31 words
In one circuit, according to claim 6, where the variable resistance includes means to turn off the power output of said magnetron at the high resistance end of said variable resistance.
Claim 11
Dependent Claim
93 words
A circuit to provide control over the power output of a magnetron which comprises: a source of alternating power, a magnetron which discharges in response to less than twice the voltage of said source of alternating power, a variable resistance in series with said magnetron, a conductive means, to conduct in a direction opposite to said magnetron, in parallel with sAid magnetron-variable resistance series, and a capacitance where said capacitance and said source of alternating power are in series and also in series with said parallel circuit of magnetron-variable resistance and conducting means.
Claim 12
Dependent Claim
93 words
A circuit to provide control over the power output of a magnetron which comprises: a source of alternating power, a magnetron which discharges in response to less than twice the voltage of said source of alternating power, a variable resistance in series with said magnetron, a conductive means, to conduct in a direction opposite to said magnetron, in parallel with sAid magnetron-variable resistance series, and a capacitance where said capacitance and said source of alternating power are in series and also in series with said parallel circuit of magnetron-variable resistance and conducting means.
Claim 13
Dependent Claim
24 words
A circuit, according to claim 8, where said variable resistance''s low resistance section is designed to handle more power than the other resistance sections.
Claim 14
Dependent Claim
30 words
A circuit, according to claim 8, where said variable resistance includes means for turning off the power output of said magnetron at the high resistance end of said variable resistance.
Claim 15
Dependent Claim
76 words
A circuit to provide control over the power output of a magnetron comprising a source of power, a magnetron discharging from said source of power, an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure-to-permit-control of said variable resistance by an operator of said circuit, and where the low resistance section of said variable resistance is designed to handle more power than the other resistance sections.
Claim 16
Dependent Claim
76 words
A circuit to provide control over the power output of a magnetron comprising a source of power, a magnetron discharging from said source of power, an improved variable resistance for varying the power output of said magnetron, said improved variable resistance comprising in combination: structure-to-permit-control of said variable resistance by an operator of said circuit, and where the low resistance section of said variable resistance is designed to handle more power than the other resistance sections.
Claim 17
Dependent Claim
37 words
A circuit, according to claim 11, where said structure-to-permit-control includes a ratchet and ratchet release structure, means to return said structure-to-permit-control to the high resistance end of said variable resistance when said ratchet release releases said ratchet.
Claim 18
Dependent Claim
26 words
A circuit, according to claim 11, where said structure-to-permit-control includes means-for-turning-off the power output of said magnetron at the high resistance end of said variable resistance.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |