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Title: Temperature sensitive resistor having a critical transition temperature of about 140.degree.C



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Claims: What is claimed is:

1. A solid state switching device comprising a temperature sensitive resistive element of V.sub.3 O.sub.5 material which exhibits an abrupt decrease in electrical resistance at about 140.degree.C, and electrode lead wires attached to spaced points of said temperature sensitive resistive element for connecting such temperature sensitive resistive element to an electrical circuit.

2. A solid state switching device as defined in claim 1, wherein the temperature sensitive material is in the form of a thin film deposited on a supporting substrate, and further comprising metallic pads in contact with said temperature senstitive material at said spaced points, said electrode lead wires being welded to said metallic pads.

3. A solid state switching device as defined in claim 1, wherein the temperature sensitive resistive element is selected from the group consisting of a single crystal, a polycrystalline aggregate, a sintered powder and a thick film paste.

4. A solid state switching device as defined in claim 2, wherein the insulating substrate is made of single crystal quartz.

5. A solid state switching device as defined in claim 1, wherein the resistive element of V.sub.3 O.sub.5 is doped with doping material to increase or decrease the transition temperature.

6. A solid state switching device as defined in claim 5, wherein said doping material is germanium to decrease the transition temperature in the range of 100.degree.-140.degree.C.

Other info:


Inventors: Eastwood, H. Keith (Beaconsfield, CA, US)
Simon, Thomas R. (Cote St. Luc, CA, US)
Khoi, Nguyen N. (Montreal, CA, US)

Application Number: 500732
Filing Date: 1974-08-26
Publication_date: 1976-02-03
Assignee: Multi-State Devices, Ltd. (Dorval, CA)
Primary Class(es): 338/25 252/520.4, 338/22SD
Other Classes:
US Patent Ref:
2884508Apr, 1959Czipott et al.338/309.
3295087Dec, 1966Landis et al.338/22.
3402131Sep, 1968Futaki et al.338/22.
3452314Jun, 1969Sapoff et al.338/309.
3650680Mar, 1972Teeg et al.423/592.

Other Refs:
Primary Examiner: Albritton, C. L.
Assistant Examiner:
Attorney: Spencer & Kaye