Patents by Inventor James D. Prestel

James D. Prestel 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 materials for reconditioning a toner cartridge
    Patent number: 5110646
    Abstract: A process and apparatus for reconditioning a toner cartridge of the type used in laser printers after the toner has been exhausted. The process includes removing the magnetic roller to expose an elongated toner opening and covering the elongated toner opening with a perforated separator sheet. Next, the magnetic roller is replaced, and the cartridge is refilled with toner only to be regenerated by tearing off the center portion of the separator sheet. The separator sheet has a perforation pull-off center portion and an adhesive backing.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: May 5, 1992
    Assignee: James D. Prestel
    Inventors: James D. Prestel, Mitchel S. Hose, Paul J. Barbour