Patents by Inventor Warren L. Bletscher, Jr.

Warren L. Bletscher, Jr. 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).

  • Write calibration for magnetooptic disk recorders
    Patent number: 5070495
    Abstract: Recording operations for an optical disk recorder are calibrated by adjusting recording power level (light intensity) such that a permissible crosstalk can be detected in adjacent erased tracks. Following the power level calibration, pulse duration or width is calibrated for a predetermined symmetry of recorded pulses along the calibration track. Various sequences and procedures are described. Calibration occurs at a plurality of radially spaced-apart tracks.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: December 3, 1991
    Assignee: International Business Machines Corporation
    Inventors: Warren L. Bletscher, Jr., Julian Lewkowicz, Morovat Tayefeh