Patents by Inventor Robert A. Fischer

Robert A. Fischer 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: 8432835
    Abstract: Examples of systems described herein include videoconferencing systems having audio/visual components coupled to a codec. The codec may be configured by a control system. Communication networks having different security levels may be alternately coupled to the codec following appropriate configuration by the control system. The control system may also be coupled to the communication networks.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: April 30, 2013
    Assignee: Sandia Corporation
    Inventors: David H. Dirks, Diane Gomes, Corbin J. Stewart, Robert A. Fischer
  • Patent number: 4548358
    Abstract: A multiple piece cutting tip for a cutting torch. An outer body with an inner body coaxially positioned therein forms a first passageway therebetween for transmitting preheat fuel and oxygen. A helical mixer in the first passageway more completely mixes the fuel and the oxygen. The first passageway includes a plurality of openings about the inner body at the tip end of the first passageway for preheating. The inner body includes a second passageway therethrough for the passage of cutting oxygen and the inner body includes a connection for changing the cross-sectional area of the second passageway. Radially extending ribs are provided about the outside of the outer body adjacent the tip for dissipating heat. The size of the second passageway may be modified by an elongate tubular member adapted to be threaded into the inner body and telescopically extend into the second passageway for changing the size of the second passageway.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: October 22, 1985
    Inventor: Robert A. Fischer
  • Patent number: 4458884
    Abstract: In a two tube cutting torch having a torch head and a body with a first cutting oxygen tube supplying oxygen from the body to the head and a second preheat tube supplying oxygen and fuel from the body to the head in which the body has a fuel inlet and an oxygen inlet and control means connected to the body for controlling the flow of fuel and oxygen, the improvement of a head mixer and thermal conductor. A member is connected between the preheat tube and the head and the member includes a straight through bore interconnecting the preheat tube and the head and the bore at the tube end is in communication with oxygen in the preheat tube. The member also includes one or more passageways extending from the tube end and is in communication with fuel in the preheat tube. The member includes one or more holes adjacent the head end extending from the bore to the passageways for aspirating fuel from the passageways into the bore and mixing in the head as oxygen flows through the bore to the head.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: July 10, 1984
    Inventor: Robert A. Fischer
  • Patent number: 4413809
    Abstract: In a cutting torch having a torch head, a body having a fuel inlet and an oxygen inlet, control means connected to the body for controlling the flow of fuel and oxygen, a preheat tube assembly and a cutting oxygen tube assembly connected between the body and the head, the improvement in the preheat tube assembly for preventing flashback. An inner tubular member, preferably of brass, has a straight through bore with a fluid tight seal at the torch head by being threaded into the torch head and sealed with an O-ring seal. The opposite end connects to the body having a seal making a gas tight connection around a fuel passageway. The inner bore acts as an oxygen mixing chamber with no restrictions or orifices and consists of a single size diameter hole lengthwise through the member.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: November 8, 1983
    Inventor: Robert A. Fischer