Patents by Inventor Heinz Winterer

Heinz Winterer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process and apparatus for producing silicon ingots having high oxygen content by crucible-free zone pulling, silicon ingots obtainable thereby and silicon wafers produced therefrom
    Patent number: 5089082
    Abstract: Silicon ingots, in particular, with diameters of approximately 75 mm and greater, can be produced by zone pulling with an oxygen content comparable to crucible-pulled material if a flat quartz element is brought into contact with the molten cap during the pulling operation. A quartz ring which is arranged concentrically beneath the induction heating coil and can be lowered from a rest position into its working position on the molten cap is suitable as a flat element. The ingot material obtained in this manner and also the silicon wafers produced therefrom combine the purity advantages of zone-pulled silicon with the beneficial gettering and hardening action of the incorporated oxygen which otherwise distinguishes only crucible-pulled silicon.
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: February 18, 1992
    Assignee: Wacker-Chemitronic Gesellschaft fur Elektronik-Grundstoffe mbH
    Inventors: Peter Dreier, Wilfried von Ammon, Heinz Winterer