Patents by Inventor Per A. Edstrom

Per A. Edstrom 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 a system for synchronizing clocks in a bus type local network
    Patent number: 4815110
    Abstract: The invention relates to a method of synchronizing clocks contained in a local network of bus type, such as Ethernet and a system of synchronizing clocks. In local networks of this kind a number of nodes are connected to a common data channel. The object of the invention is to obtain a method and a system of synchronizing the clocks which is more accurate than previous methods and systems, in which the synchronizing information is transmitted as common data packages in which the receiver of the synchronizing information does not know the instant of the data package generation. According to the invention a synchronizing message is transmitted from one node which has been chosen to be the master to all nodes, the master node inclusive. When receiving a synchronizing message the nodes read the clock state. Then the master node transmits a clock time message containing the master node clock state when it received the synchronizing message.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: March 21, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Bengt H. Benson, Per A. Edstrom