Patents by Inventor Häkan O. Ahl

Häkan O. Ahl 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: 6259620
    Abstract: A content addressable memory (CAM) permits a matching operation to be performed over multiple stored entries. The CAM includes a matrix of cells having (n+1) columns and m rows, wherein n and m are each integers greater than or equal to 1, and wherein each row of cells comprises: n data storage cells; a carry storage cell; word compare logic; and carry write logic. For each word of CAM storage, the data storage cells store bits representing one of a number of fractional parts of the data to be stored. The carry storage cell stores a signal that represents whether a previous row generated a match in a preceding matching operation. By presenting fractional parts of a large comparand in sequence, a final compare operation generates an output that indicates whether the entire comparand (i.e., the fractional parts of the comparand considered together) matched a stored entry in the CAM.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: July 10, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars-{haeck over (O)}rjan Kling, Häkan O. Ahl, Kjell G. Torkelsson