Abstract: An oven door comprising front and back metal door panels having a central opening therein to provide a window for see-through into the oven compartment. A window unit is mounted in the window opening and comprises inner and outer transparent glass panels mounted in spaced, parallel relation in a common supporting frame. The inner glass panel is fixed in said frame while the outer glass panel is removably mounted therein. Means is provided for releasably securing the outer glass panel in said frame such that it can be readily removed for replacement or for cleaning the inner surfaces of the panels without disturbing the inner glass panel, the supporting frame, or the oven door proper.

Abstract: Means for supporting a glass sheet substrate during the sputter-coating of a thin film of metal or metal-alloy thereon, comprising a rigid metal platen having a major supporting surface, and an overlay for the metal platen consisting of at least one glass plate covering the major supporting surface of the platen and directly supporting thereon the glass sheet substrate during the sputter-coating operations.

Abstract: A cathode for use in the sputter-coating of thin films of a selected coating material on glass sheets or other substrates. The cathode is of rectangular boxlike construction having a closed chamber therein containing a plurality of spaced partitions arranged to form a serpentine passageway through which a cooling medium is circulated. The side and end walls of the cathode defining the closed chamber extend above the top wall of said chamber and are provided with outwardly directed flanges which form a continuous rim for supporting the cathode in operative position in the coating apparatus.