Patents by Inventor Richard T. Larson

Richard T. Larson 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).

  • Rotary actuator for file protect function
    Patent number: 4320421
    Abstract: Structure for providing a file protect function for a removable cartridge which houses a magnetic recording medium includes a rotary actuator in a sleeve member, the actuator having an outer disk and an inner disk. The actuator may be rotated in the sleeve to either of two positions 180.degree. apart by application of force to the outer disk. The inner disk has an interrupted segment therein, and the rotational position of this interrupted segment controls the enabling or disabling of the circuitry for recording on the magnetic medium.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: March 16, 1982
    Assignee: International Business Machines Corporation
    Inventors: Richard T. Larson, David H. McMurtry, Helfried O. Rinkleib