Patents by Inventor Phillip Chang

Phillip Chang 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).

  • Non-contact developer seal
    Patent number: 4616919
    Abstract: A sealing apparatus in a magnetic brush development device is located in a non-contact fashion between the photoconductor drum and the magnetic brush roll. The seal has a plurality of ridges along the length of the seal that creates a differential air flow under the rotating photoconductor drum. This differential air flow prevents toner dust and bead carryout from axially migrating past the end of the photoconductor and magnetic roll.
    Type: Grant
    Filed: September 5, 1985
    Date of Patent: October 14, 1986
    Assignee: International Business Machines Corporation
    Inventors: James M. Adley, Phillip Chang