Patents by Inventor Peter P. Campbell

Peter P. Campbell 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 precompensation and write encoding for FM and MFM recording
    Patent number: 4245263
    Abstract: Information to be written in the form of magnetic flux reversals on the surface of a disk or diskette is applied in serial fashion to a first shift registor. The parallel outputs of the shift register address a PROM. The PROM output is applied to a second shift register in the form of clock and data bits to be written on the disk or diskette magnetic surface. Control signals applied to the PROM address terminals select the mode, FM or MFM, the address mark or if precompensation is required.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: January 13, 1981
    Assignee: Honeywell Information Systems Inc.
    Inventors: Donald J. Rathbun, Peter P. Campbell