Patents by Inventor Alex G. Tweedly

Alex G. Tweedly 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).

  • Content - based filtering of multicast information
    Patent number: 6389475
    Abstract: The invention provides a method and system for content-based filtering of multicast information. A set of sources (S) which desire to distribute potentially large numbers of categories of differing information each associates a content descriptor (CD) with messages including information in those categories, so that a set of recipients (R) can receive information in at least some of those categories. A mapping server (M) associates a multicast address (MA) and a content mask (CM) with each content descriptor, so that network elements (N), such as routers, in the network can distribute only those messages which are of interest to recipients in multicast distribution trees for those multicast addresses. Each source generates content descriptors for each differentiable topic in a tree structured hierarchy, and obtains a multicast address and a content mask for the broadest content descriptor it is capable of distributing.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: May 14, 2002
    Assignee: Cisco Technology, Inc.
    Inventors: Tony Speakman, Alex G. Tweedly, Steven Lin, Dino Farinacci
  • Content-based filtering of multicast information
    Patent number: 6055364
    Abstract: The invention provides a method and system for content-based filtering of multicast information. A set of sources (S) which desire to distribute potentially large numbers of categories of differing information each associates a content descriptor (CD) with messages including information in those categories, so that a set of recipients (R) can receive information in at least some of those categories. A mapping server (M) associates a multicast address (MA) and a content mask (CM) with each content descriptor, so that network elements (N), such as routers, in the network can distribute only those messages which are of interest to recipients in multicast distribution trees for those multicast addresses. Each source generates content descriptors for each differentiable topic in a tree structured hierarchy, and obtains a multicast address and a content mask for the broadest content descriptor it is capable of distributing.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: April 25, 2000
    Assignee: Cisco Technology, Inc.
    Inventors: Tony Speakman, Alex G. Tweedly, Steven Lin, Dino Farinacci