Patents by Inventor Sam C. Carapella

Sam C. Carapella 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 for the production of photoconductive zinc oxide of improved electrophotographic properties, and product thereof
    Patent number: 4248953
    Abstract: Photoconductive zinc oxide characterized by having improved electrophotographic properties and particularly increased discharge speed, and produced by a process involving mixing the photoconductive zinc oxide powder to be improved with 0.01% by weight or more tellurium calculated as Te, and contacting the thus-obtained mixture with a free oxygen-containing gas while heating the mixture at elevated temperature sufficiently high and for a time sufficient to result in the zinc oxide having the improved electrophotographic properties. The heating temperature and/or heating time is held below that temperature or time at which sintering of the thus-treated product occurs.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: February 3, 1981
    Assignee: ASARCO Incorporated
    Inventors: Charles L. Thomas, Sam C. Carapella