Patents by Inventor Duncan S. Furness

Duncan S. Furness 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).

  • Head positioning mechanism for rotating disk data storage system
    Patent number: 4812929
    Abstract: A fine position closed loop servo system is disclosed for magnetic disk storage media having a plurality of data storage disks in which a first servo burst is contained on the surface of one of the data storage disks, the servo burst data being spaced at radial positions one-half track displaced from each of the odd-numbered concentric track centerlines and a second servo burst signal is contained on the surface of another of the data storage disks, the second servo burst signal being recorded at radial positions one-half track displaced from the even-numbered concentric track centerlines. Both the first and second servo burst data are read simultaneously utilizing the data transducers associated with the surfaces of the respective data storage disks and the envelopes of each of the servo burst signals are simultaneously, separately detected.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: March 14, 1989
    Assignee: Rodime PLC
    Inventors: Alexander Stewart, Duncan S. Furness, Sham P. Bhatia
  • Head positioning mechanism for rotating disk data storage system
    Patent number: 4638384
    Abstract: A fine position closed loop servo system is disclosed for magnetic disk storage media having a plurality of data storage disks in which a first servo burst is contained on the surface of one of the data storage disks, the servo burst data being spaced at radial positions one-half track displaced from each of the odd-numbered concentric track centerlines and a second servo burst signal is contained on the surface of another of the data storage disks, the second servo burst signal being recorded at radial positions one-half track displaced from the even-numbered concentric track centerlines. Both the first and second servo burst data are read simultaneously utilizing the data transducers associated with the surfaces of the respective data storage disks and the envelopes of each of the servo burst signals are simultaneously, separately detected.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: January 20, 1987
    Assignee: Rodime, PLC
    Inventors: Alexander Stewart, Duncan S. Furness, Sham P. Bhatia