Patents by Inventor John C. McAlister

John C. McAlister 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).

  • Control of magnetic printed sheets
    Patent number: 6032779
    Abstract: Banknotes printed with magnetic ink pass through a tri-color age detector 34, and then between a pair of premagnetization rollers (10,12) having opposite magnetic polarity of such strength that the magnetic signature of all banknotes is enhanced to the same level; the notes are then stacked 50 in an electromagnetic stacker 42. Such notes, having magnetic signatures of the same level, can also be recognized and/or validated by magnetic techniques also.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: March 7, 2000
    Assignee: NCR Corporation
    Inventors: John C. McAlister, Philip J. Heelan