Patents by Inventor Richard T. Purdy

Richard T. Purdy 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).

  • Cleaning disk with opaque ring
    Patent number: 4499516
    Abstract: A cleaning disk made of a thin fibrous material is provided with an opaque ring so that the cleaning disk will look like magnetic media to the sensors of a flexible disk system. The opaque ring may be in the form of a separate plastic ring which is bonded to the cleaning disk and extends to the center opening of the disk. Such a structure provides the requisite opaque area as well as providing reinforcement to the central area of the cleaning disk.
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: February 12, 1985
    Assignee: Perfect Data Corporation
    Inventors: Richard T. Purdy, Alden H. Packard