Patent ID: 6870134
Filing Date: 2005-03-22
Classification: B32B,H05B

Abstract:
1. A heatable vehicle windshield comprising: first and second substrates laminated together via at least one interlayer, the interlayer comprising a polymer; a coating supported by one of the substrates, the coating including at least one heatable conductive layer; first and second bus bars in electrical communication with the at least one heatable conductive layer of the coating so that when electric current is passed through the at least one conductive layer of the coating via the bus bars the at least one conductive layer generates heat in order to heat at least a portion of the vehicle windshield; the first bus bar including a conductive base layer and an elongated conductive braid, wherein a first portion of the conductive base layer of the first bus bar is provided on the first substrate in an area where the coating is not present so as to be electrically insulated from the coating, and a second portion of the conductive base layer of the first bus bar is provided on the first substrate over and in contact with a portion of the coating; wherein, on at least part of the first portion of the conductive base layer where the conductive base layer is spaced from and electrically insulated from the coating, the conductive braid is provided over and in electrical communication with the conductive base layer along at least part of a length of the braid; wherein at least part of the conductive base layer is provided electrically between the conductive braid and the coating so that current flowing between the braid and coating flows through the conductive base layer; and wherein the coating is continuously provided across a central viewing area of the windshield, so that there are no holes or gaps in the coating in the central viewing area of the windshield.