Patents by Inventor Rolf L. Hofmann

Rolf L. Hofmann 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).

  • Apparatus and method for reading punched cards
    Patent number: 4393302
    Abstract: The present invention relates to an apparatus and a method for reading punched cards and, more particularly, to such apparatus, and method for reading gravity-fed punched cards.This apparatus comprises a reference perforation sensor located upstream of the hole sensors so as to sense the duration of the passage of a reference perofaration cut out in a card, before any hole position faces the set of hole sensors.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: July 12, 1983
    Assignee: Advanced Card Systems, Ltd.
    Inventor: Rolf L. Hofmann