Patents by Inventor David B. Logan

David B. Logan 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: 6578066
    Abstract: The actual site that serves the Web pages to a client in response to a URL domain name is automatically and transparently selected from a list of many switches each having identical data storage. In a peer hand-off process, a switch receives domain name server lookup request for a particular virtual Internet protocol (VIP) domain name. The switch examines the source IP-address for the domain name server request, examines the user's IP-address, and determines if there is server site that is geographically close to that user. The switch examines an ordered hand-off table corresponding to the domain. The switch chooses a next remote server (or its own VIP) in line based on, (a) the remote server location compared to domain name server request source, (b) the remote servers' weights, and (c) the remote server that experienced the previous hand-off. The switch then sends the domain name server response back to client domain name server with the IP-addresses in an ordered list.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: June 10, 2003
    Assignee: Alteon Websystems
    Inventors: David B. Logan, Shirish Sathaye