Patents by Inventor John Turnbull Cattanach

John Turnbull Cattanach 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).

  • Ordering keys in a table using an ordering mask
    Patent number: 6397216
    Abstract: The present invention is a mask ordering method and apparatus which controls the way keys are compared. In its general form, the mask ordering method operates to order (with a less than, greater than or equal to comparison) two N-byte (for example, N=16) keys (Key—1 and Key—2) using an N-bit ordering mask where the N bits in the ordering mask correspond one for one with the N bytes in the keys in the same compare direction (either left-to-right or right-to-left).
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: May 28, 2002
    Assignee: Amdahl Corporation
    Inventors: John Turnbull Cattanach, Kai Chiu Wong