Patents by Inventor Ewald Dittmar

Ewald Dittmar 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: 5802263
    Abstract: A method of message transmission between users in a distributed system with token passing includes a special token procedure in order to achieve consistent message transmission, even in the case of a fault. The special token procedure is based on a coincidence of monitoring and information states of the users. In the case of an error, a logical resumption, which is derived from a consecutive sequence number, is carried out without adversely affecting data consistency. The method can be implemented in different versions, that is with information passing of user data in the form of a ring or the transmission of user data in physical multicast and the passing of associated check information in the form of a ring. The method can be used in supervisory control installations.
    Type: Grant
    Filed: September 11, 1995
    Date of Patent: September 1, 1998
    Assignee: ABB Patent GmbH
    Inventors: Ewald Dittmar, Hans Dieter Kochs, Werner Dieterle
  • Patent number: 5784547
    Abstract: A method for fault-tolerant communication under strictly real-time conditions in a local network uses a double bus architecture for reporting faults and for tolerating global bus faults. An active fault detection and notification mechanism is provided in order to safeguard consistency in the case of a fault and in order to comply with time limits regarding transmission of data. During fault-free operation, all of the process data are transmitted in one of the redundant bus systems and status information is transmitted in the other bus system. In the case of a fault, each bus is used as a watchdog bus in order to notify the network subscribers of faults occurring in the respective other bus system. The method can be used in process-oriented control and automation systems which have stringent requirements regarding reliability and real-time behavior.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: July 21, 1998
    Assignee: ABB Patent GmbH
    Inventors: Ewald Dittmar, Hans-Dieter Kochs, Holger Hilmer