US4253092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave leakage detector
Assignee: Individual
•
Filing: 1979-04-19
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Granted: 1981-02-24
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Expires: 1999-04-19
Abstract
Abstract A microwave leakage detector which can be attached onto a microwave oven, or similar device, and will detect leakage of microwave signal of a predetermined frequency. The leakage detector can be removed from the oven and periodically utilized as a hand held unit for scanning around the oven door, window, and other parts. An alarm will sound when the microwave signal received is above a preset minimum amount. The preset amount can be varied as desired in order to meet safety standards.
Inventors
- 👤 John F. Connah, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:42
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6432; G; G01; G01R; G01R19/00; G01R19/165; G01R19/16566; G01R19/16585; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; H05B6/6447
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
245 words
A microwave leakage detector comprising: a housing means; coupling means for retaining the housing onto a microwave producing device; an antenna positioned on the housing means for detecting a predetermined microwave frequency from the microwave producing device; an electric circuit contained in said housing means and comprising a comparator, a threshold level means coupled to one input of the comparator for setting a preselected amount of acceptable microwave leakage, the output from the antenna coupled to the other input of the comparator, said comparator producing an output when the amount of said predetermined microwave frequency received exceeds said preselected amount, and an alarm means supported by said housing means and activated by the output of said comparator, wherein said threshold level means comprises a variable potentiometer, whose output is coupled to the positive input of the comparator, and further comprising a capacitor serially connected between said antenna and the negative input of the comparator, a first diode and a microwave choke connected in series and placed in parallel across said capacitor, a direct connection between said antenna and the interconnection between said first diode and said choke, and a second diode interconnected between a resistor and said potentiometer, whereby a microwave signal received by said antenna causes the capacitor to produce a negative voltage, whereby upon receiving sufficient leakage microwave signals, the voltage at the negative input to the comparator is sufficiently reduced below the positive voltage to cause the comparator to produce an output.
Claim 2
Dependent Claim
245 words
A microwave leakage detector comprising: a housing means; coupling means for retaining the housing onto a microwave producing device; an antenna positioned on the housing means for detecting a predetermined microwave frequency from the microwave producing device; an electric circuit contained in said housing means and comprising a comparator, a threshold level means coupled to one input of the comparator for setting a preselected amount of acceptable microwave leakage, the output from the antenna coupled to the other input of the comparator, said comparator producing an output when the amount of said predetermined microwave frequency received exceeds said preselected amount, and an alarm means supported by said housing means and activated by the output of said comparator, wherein said threshold level means comprises a variable potentiometer, whose output is coupled to the positive input of the comparator, and further comprising a capacitor serially connected between said antenna and the negative input of the comparator, a first diode and a microwave choke connected in series and placed in parallel across said capacitor, a direct connection between said antenna and the interconnection between said first diode and said choke, and a second diode interconnected between a resistor and said potentiometer, whereby a microwave signal received by said antenna causes the capacitor to produce a negative voltage, whereby upon receiving sufficient leakage microwave signals, the voltage at the negative input to the comparator is sufficiently reduced below the positive voltage to cause the comparator to produce an output.
Claim 3
Dependent Claim
253 words
A microwave leakage detector comprising: a housing means; coupling means for retaining the housing onto a microwave producing device; an antenna positioned on the housing means for detecting a predetermined microwave frequency from the microwave producing device; an electronic circuit contained in said housing means and comprising a comparator, a threshold level means coupled to one input of the comparator for setting a preselected amount of acceptable microwave leakage, the output from the antenna coupled to the other input of the comparator, said comparator producing an output when the amount of said predetermined microwave frequency received exceeds said preselected amount, and an alarm means supported by said housing means and activated by the output of said comparator, wherein said threshold level means comprises a variable potentiometer whose output is coupled to the negative input of the comparator, and further comprising a first capacitor and first diode serial connected between the antenna and the negative input of the comparator, first and second resistors connected in series and coupled in parallel across said first capacitor and first diode, a second capacitor coupled in parallel across a first one of said resistors, a direct connection between said antenna and the connection point between said first and second resistors, a direct connection between said potentiometer and a second diode coupled between said potentiometer and a resistor whereby upon receiving sufficient leakage microwave signals the voltage at the positive input to the comparator is sufficiently increased above the negative voltage to cause the comparator to produce an output.
Claim 4
Dependent Claim
253 words
A microwave leakage detector comprising: a housing means; coupling means for retaining the housing onto a microwave producing device; an antenna positioned on the housing means for detecting a predetermined microwave frequency from the microwave producing device; an electronic circuit contained in said housing means and comprising a comparator, a threshold level means coupled to one input of the comparator for setting a preselected amount of acceptable microwave leakage, the output from the antenna coupled to the other input of the comparator, said comparator producing an output when the amount of said predetermined microwave frequency received exceeds said preselected amount, and an alarm means supported by said housing means and activated by the output of said comparator, wherein said threshold level means comprises a variable potentiometer whose output is coupled to the negative input of the comparator, and further comprising a first capacitor and first diode serial connected between the antenna and the negative input of the comparator, first and second resistors connected in series and coupled in parallel across said first capacitor and first diode, a second capacitor coupled in parallel across a first one of said resistors, a direct connection between said antenna and the connection point between said first and second resistors, a direct connection between said potentiometer and a second diode coupled between said potentiometer and a resistor whereby upon receiving sufficient leakage microwave signals the voltage at the positive input to the comparator is sufficiently increased above the negative voltage to cause the comparator to produce an output.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |