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Electrical devices comprising a PTC element comprised of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into

Electrical devices comprising a PTC element comprised of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The polymer PTC composition is melt-shaped to form a laminar shaped PTC element. First and second opposing surfaces of the PTC element are coated with a conductive layer. The electrodes, characterized by a plurality of voids, are brought into contact with the coated surfaces of the PTC element, and heated while applying pressure to form a laminate. The laminate is then further shaped into a plurality of PTC electrical circuit protection devices.

대표청구항 ▼

[ I claim:] [1.] A method of making an electrical device comprising the steps of:providing a PTC element having first and second surfaces, said PTC element including a polymer with conductive particles dispersed therein;coating said first surface of said PTC element with a conductive layer;coating s

[ I claim:] [1.] A method of making an electrical device comprising the steps of:providing a PTC element having first and second surfaces, said PTC element including a polymer with conductive particles dispersed therein;coating said first surface of said PTC element with a conductive layer;coating said second surface of said PTC element with a conductive layer;bringing said first coated surface of said PTC element into contact with a first electrode, said electrode having an inner surface and an outer surface with a plurality of voids;bringing said second coated surface of said PTC element into contact with a second electrode, said electrode having an inner surface and an outer surface with a plurality of voids;heating and applying pressure to said PTC element, said conductive layers and said electrodes causing a portion of each electrode to extend through each conductive layer, respectively, and physically contact the PTC element to form a laminate; and,forming said laminate into a plurality of electrical devices.