Patents by Inventor Pierre A. Humblet

Pierre A. Humblet 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: 5128798
    Abstract: Apparatus is described for achieving wavelength selection. Furthermore, the apparatus exhibits very high wavelength resolution, stable operation and rapid returning. A bundle of multi-wavelength light, entering the device, is acoustooptically deflected. This is done by driving two orthogonal acoustic transducrs of the deflector with two suitable frequencies fx and fy. The light so deflected passes first through a wedge etalon having a taper along the X-axis and then through a second wedge etalon having a taper along the Y-axis. The pair of wedges forms two, single-cavity etalons. Depending on the choice of fx and fy, any wavelength within the wavelength range covered by the two, single-cavity etalons can be selected rapidly and accurately.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: July 7, 1992
    Assignee: International Business Machines Corporation
    Inventors: Donald F. Bowen, Pierre A. Humblet, Franklin F. Tong
  • Patent number: 4987536
    Abstract: The communications network includes a plurality of interconnected nodes and communication links between nodes. Computing apparatus in provided for determining a shortest path from a starting node to a destination node. The computing apparatus is adapted so that each node forms a routing tree having nodes with indentities, branches with weights, and a distinguished node called a root. The routing tree is the estimated shortest path to all of the nodes and each node communicates its routing tree to each adjacent node. Upon receipt of a routing tree by a reference node from an adjacent node, the reference node stores the routing tree and produces a large tree having roots and branches by placing the reference node as the root of the large tree and creating branches from the reference node to the roots of the routing trees of the adjacent nodes. The lengths of the branches are equal to the lengths of the links from the reference node to the adjacent nodes.
    Type: Grant
    Filed: May 12, 1988
    Date of Patent: January 22, 1991
    Assignee: Codex Corporation
    Inventor: Pierre A. Humblet
  • Patent number: 4901277
    Abstract: Data flow in a communications network is controlled by a downstream node specifying the maximum average speeds of a plurality of data streams sent from an upstream node on a plurality of data paths.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: February 13, 1990
    Assignee: Codex Corporation
    Inventors: Stuart R. Soloway, Bradford R. Steinka, Pierre A. Humblet
  • Patent number: 4562423
    Abstract: A stream of source characters, which occur with varying relative frequencies, is encoded into a compressed stream of codewords, each having one, two or three subwords, by ranking the source characters by their current frequency of appearance, encoding the source characters having ranks no higher than a first number as one sub-word codewords, source characters having ranks higher than the first number but no higher than a second number as two sub-word codewords, and the remaining source characters as three sub-word codewords. The first number is changed and the second number is recalculated as required by the changing frequencies of the source characters to minimize the length of the stream of codewords.
    Type: Grant
    Filed: June 5, 1984
    Date of Patent: December 31, 1985
    Assignee: Codex Corporation
    Inventor: Pierre A. Humblet