US3678486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring system
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1969-10-16
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Granted: 1972-07-18
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Expires: 1989-10-16
Abstract
Abstract A temperature indication system particularly adapted for brake usages provided which includes a plurality of temperature sensors such as thermocouples cooperating with field effect transistor switches controlled by a digital decoder to effectively pass only one of a plurality of signals entering the switch at one time to a single amplifier. The output of the amplifier may be logically compared to provide a high temperature signal indication, or an exact temperature signal indication, depending upon the readout characteristics desired.
Inventors
- 👤 David P Bickel
- 👤 Melvin H Davis
- 👤 Karl H Starks Jr
- 👤 John Tsoras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:15
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021; G01K1/00; G01K1/02; G01K1/024; G08; G08C; G08C15/00; G08C15/06; F; F16; F16D; F16D66/00; F16D2066/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A system for monitoring and indicating the temperatures of a plurality of brakes in a vehicle, comprising: a plurality of temperature sensors, at least one sensor being locAted at each brake, each sensor producing an electrical output signal proportional to the temperature of the sensor location, at least one junction box located near the sensors and receiving the sensors signals therein, a single temperature compensation circuit associated with each junction box and cooperating with all the sensors associated with each respective box and producing an electrical output signal indicative of the temperature in the junction box, two separate multiplexing circuits comprising a common clock driving a common digital decoder, separate field effect transistor switches for multiplexing the sensor signals and the compensator signals separately, and a common amplifier receiving and combining the sensor and compensator signals, logic means to control the switches to sequentially actuate to pass only one temperature signal and its respective compensation signal at a time to the common amplifier, and circuit means to receive the amplified signals and provide an indication thereof.
Claim 2
Independent Claim
176 words
A system for monitoring and indicating the temperatures of a plurality of brakes in a vehicle, comprising: a plurality of temperature sensors, at least one sensor being locAted at each brake, each sensor producing an electrical output signal proportional to the temperature of the sensor location, at least one junction box located near the sensors and receiving the sensors signals therein, a single temperature compensation circuit associated with each junction box and cooperating with all the sensors associated with each respective box and producing an electrical output signal indicative of the temperature in the junction box, two separate multiplexing circuits comprising a common clock driving a common digital decoder, separate field effect transistor switches for multiplexing the sensor signals and the compensator signals separately, and a common amplifier receiving and combining the sensor and compensator signals, logic means to control the switches to sequentially actuate to pass only one temperature signal and its respective compensation signal at a time to the common amplifier, and circuit means to receive the amplified signals and provide an indication thereof.
Claim 3
Dependent Claim
26 words
A system according to claim 1 where the logic means includes a circuit to continuously recycle the multiplexing circuits after all switches have been sequentially actuated.
Claim 4
Dependent Claim
23 words
A system according to claim 1 where there are at least two separate junction boxes each associated with sensors located in proximity thereto.
Claim 5
Dependent Claim
39 words
A system according to claim 1 where the vehicle is an airplane having at least two wheel and brake carrying struts, said sensors associated with the brakes for the wheels, and a junction box mounted to each respective strut.
Claim 6
Dependent Claim
39 words
A temperature indication system according to claim 1 where the field effect transistor is a metal-oxide-silicon representing an impedance of greater than 1012 ohms in the off state and as little as about 1 ohm in the on state.
Claim 7
Dependent Claim
54 words
A system according to claim 1 which includes a control panel, switch means on the panel to selectively choose which sensor is to be read, and means to indicate high temperature with reference to a standard, overheat temperature, and visual indicator means to indicate the exact temperature of the selected sensor on the panel.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |