Patents by Inventor Lansing Dunn Pickup

Lansing Dunn Pickup 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).

  • Patent number: 5774380
    Abstract: A Verilog simulation method significantly reduces scenario execution time of very large scale integrated (VLSI) logic models that contain high numbers of sequential devices. A computer implemented method saves the state of sequential devices into a file at a chosen point in a simulation scenario and then inputs this file to initialize another simulation scenario. The method has the ability to utilize the user defined primitive (UDP) model data for the sequential devices present in the technology library. However, using the standard data structure available in the programming language interface (PLI), it is not possible to uniquely identify individual UDPs. UDPs have the characteristic of having only one output each. Therefore, it is possible to uniquely identify each UDP by the net name which is connected to this output. An exception to this is the situation where two or more like-named UDP outputs are connected to the same net.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: June 30, 1998
    Assignee: International Business Machines Corporation
    Inventors: Lansing Dunn Pickup, Paul Richard Schwartz, Todd William Westervelt
  • Patent number: 5751595
    Abstract: A method for verifying that an integrated circuit design tool kit has not been modified in an unauthorized manner is accomplished by providing a verification procedure that, when an executable subrule of the tool kit has been selected to be part of the rule system, the executable subrule reads a table of time stamps. This table of time stamps and a key are provided, as representative data, to an authentication subrule by the executable subrule. The executable subrule and the authentication subrule perform an authentication check algorithm upon the representative data to produce remotely and locally checked data respectively. The executable subrule then provides the locally checked data to the authentication subrule which compares the locally checked data with the remotely checked data. When a match occurs between the data, the authentication subrule indicates that the executable subrule has not been modified in an unauthorized manner.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: May 12, 1998
    Assignee: International Business Machines Corporation
    Inventors: Harry John Beatty, III, Peter Claude Elmendorf, Jeannie Harrigan Panner, Bijan Salimi, Lansing Dunn Pickup