Patents by Inventor Margaret E. Claffey-Cohen

Margaret E. Claffey-Cohen 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).

  • Bi-directional parallel printer interface
    Patent number: 5239627
    Abstract: A parallel interface connects a data processor and a printer so that each may transmit information to the other or receive information from the other. The transmitted information from the data processor can be data or status signals. The data or status signals are transmitted over the same eight information lines between the data processor and the printer with a predetermined signal being sent over another line from the data processor to the printer prior to transmission over the eight lines to identify whether the transmitted information is data or status signals. The printer sends status signals to the data processor over the same eight information lines after sending a predetermined signal to the data processor over a further line that it is going to transmit.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: August 24, 1993
    Assignee: International Business Machines Corporation
    Inventors: James L. Beck, James R. Booth, James C. Buchanan, Margaret E. Claffey-Cohen, Carl P. Cole, Timothy J. Louie, Alan F. Neel, II, Lynn M. Oliver, James P., Ward, James F. Webb