Stripe coating on glass by chemical vapor deposition

Claim 1

A chemical vapor deposition coater for depositing a stripe of coating material onto glass, comprising: (A) a coater body adapted for positioning adjacent a surface of an advancing hot glass substrate, defining a reaction zone therebetween wherein a reactant may contact the surface of the hot glass substrate and deposit a coating material thereon; (B) a reactant supply conduit for admitting a flow of the reactant to the reaction zone; (C) an upstream exhaust duct for evacuating a portion of the reactant flow from the reaction zone at a point upstream from the reactant supply conduit; (D) a downstream exhaust duct for evacuating a portion of the reactant flow from the reaction zone at a point downstream from the reactant supply conduit; (E) left and right evacuation ducts for evacuating a portion of the reactant flow from the reaction zone at points on opposite sides of the reactant supply conduit in directions transverse to the movement of the glass substrate, the distance between the left and right exhaust ducts substantially defining the width of the stripe of coating material; (F) seal means for preventing the escape of reactant from the reaction zone out between the coater body and the surface of the hot glass substrate; and (G) evacuation means for independently controlling the evacuation of the flow of reactant through the upstream exhaust duct, the flow of reactant through the downstream exhaust duct, and the combined flows of reactant through the left and right exhaust ducts, in such a manner so as to cause the deposition of a stripe of coating material having a substantially uniform thickness across the width thereof.