Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1997-05-20
1999-09-21
Gellner, Michael L.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338328, H01C 710
Patent
active
059559365
ABSTRACT:
Electrical devices having a PTC element 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 and made of foam, 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.
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Hall Tom J.
Hoss Michael J.
Randle Donna L.
Shaw, Jr. Philip C.
Weber Michael J.
Easthom Karl
Gellner Michael L.
Littlefuse, Inc.
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