Patents by Inventor Jeffery C. Marriott

Jeffery C. Marriott 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).

  • Master slave industrial token passing network
    Patent number: 5012468
    Abstract: A communications network is comprised of master and slave stations. The master stations may receive a master token allowing control of the network for sending messages, and a solicit token that allowing the master stations to solicit other master stations for entry into the network. A master station receiving a solicit message answers with an acknowledgement signal and may immediately begin soliciting for successors. The slave stations receiving a solicit message may not accept the master token or the solicit token but must respond with a negative acknowledgement. Slave stations enter the network to respond to messages only. The use of slave stations allows for the implementation of simpler networks and improves network efficiency. The negative acknowledgement identifies the presence of the slave stations and allows detection of duplicate network nodes.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: April 30, 1991
    Assignee: Allen-Bradley Company, Inc.
    Inventors: Stuart B. Siegel, Jeffery C. Marriott