Patent ID: 7069779
Filing Date: 2006-07-04
Classification: A61B,G01F

Abstract:
1. A thermal flow sensor comprising: a first substrate having a first side and a second opposite side; a second substrate having a first side and a second opposite side, said first substrate being connected to said second substrate such that said second side of said first substrate abuts said first side of said second substrate; a third substrate having a first side and a second opposite side, said third substrate being connected to said second substrate such that said second side of said second substrate abuts said first side of said third substrate; wherein said second substrate having a cutout formed therein so as to form a conduit bounded by said second substrate and said second side of said first substrate and said first side of said third substrate, a heater disposed on said first side of said first substrate opposed to said conduit; and a first temperature sensor disposed on said first side of said first substrate opposed to said conduit.