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PTC device
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Patent number 5,691,688
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Issue date Nov 25, 1997
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Therm-O-Disc, Incorporated
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Jeffrey A. West
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H01 - BASIC ELECTRIC ELEMENTS
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Heating element control
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Patent number 5,658,480
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Issue date Aug 19, 1997
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Therm-O-Disc, Incorporated
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James A. Tennant
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G05 - CONTROLLING REGULATING
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PTC thermal protector
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Patent number 4,698,614
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Issue date Oct 6, 1987
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Emerson Electric Co.
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Richard E. Welch
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H01 - BASIC ELECTRIC ELEMENTS