Patents by Inventor Rolf B. Hilgendorf

Rolf B. Hilgendorf 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).

  • Method and apparatus for avoiding deadlock in a computer system with two or more protocol-controlled buses interconnected by a bus adaptor
    Patent number: 5355455
    Abstract: A method and an apparatus to avoid a deadlock in a computer system with several busses connected by a bus adapter. If units of different busses of the computer system simultaneously start operations for which more than one bus is needed, it may come to a deadlock. By introducing a BUS SUSPEND signal to one of the busses and adapting the bus-protocol to honor this signal at distinct time slots, deadlock situations are avoided.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: October 11, 1994
    Assignee: International Business Machines Corporation
    Inventors: Rolf B. Hilgendorf, Thomas Schlipf
  • Bus arbitration scheme
    Patent number: 5317696
    Abstract: A bus arbitration scheme for controlling access or mastership of a bus is disclosed. Priority of access to the bus is based not only on the time relationship of the requests for use of the bus arriving at the arbiter but also on the relative priority of each request. Thus a higher priority request will gain access to the bus before a lower priority one even if this latter request arrived at the arbiter first. The arbitration scheme is implemented by a series of logic gates.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: May 31, 1994
    Assignee: International Business Machines Corporation
    Inventor: Rolf B. Hilgendorf