Electrical heater
First Claim
1. In a sheet heater including a substrate, a semi-conductor pattern having a pair of parallel, spaced-apart, longitudinally-extending stripes and a central portion extending between and electrically connected to the stripes, and a pair of parallel, spaced-apart, longitudinally-extending conductors one of which overlies and engages each of the stripes, that improvement wherein:
- each said conductor has a width greater than that of the respective underlying stripe of said semi-conductor pattern, and includes a pair of transversely-spaced, longitudinally-extending strip portions and a central portion including a plurality of longitudinally-spaced openings located therebetween,the said strip portion nearer the inner edge of the conductor overlying and engaging a respective one of said stripes; and
,a sealing layer of insulating material overlies the respective conductor, said sealing layer being sealed to said substrate adjacent the transversely inner and outer edges of the conductor and through said longitudinally-spaced openings.
4 Assignments
0 Petitions
Accused Products
Abstract
A sheet heater including a substrate, a semi-conductor pattern (typically of colloidal graphite) having a pair of parallel, spaced-apart, longitudinally-extending stripes and a central portion extending between and electrically connected to the stripes, and a pair of parallel, spaced-apart, longitudinally-extending conductors one of which overlies and engages each of the stripes. Each conductor is significantly wider than the underlying stripe of the semi-conductor pattern, and includes a longitudinally extending strip portions along the inner and outer edges of the conductor, and a plurality of longitudinally-spaced openings located therebetween. The strip portion at the inner edge of the conductor overlies and engages a respective stripe; and a sealing layer of insulating material overlies the respective conductor and is sealed to the substrate along the inner and outer edges of the conductor and through the longitudinally spaced openings.
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Citations
8 Claims
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1. In a sheet heater including a substrate, a semi-conductor pattern having a pair of parallel, spaced-apart, longitudinally-extending stripes and a central portion extending between and electrically connected to the stripes, and a pair of parallel, spaced-apart, longitudinally-extending conductors one of which overlies and engages each of the stripes, that improvement wherein:
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each said conductor has a width greater than that of the respective underlying stripe of said semi-conductor pattern, and includes a pair of transversely-spaced, longitudinally-extending strip portions and a central portion including a plurality of longitudinally-spaced openings located therebetween, the said strip portion nearer the inner edge of the conductor overlying and engaging a respective one of said stripes; and
,a sealing layer of insulating material overlies the respective conductor, said sealing layer being sealed to said substrate adjacent the transversely inner and outer edges of the conductor and through said longitudinally-spaced openings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification