Patents by Inventor David A. Holdeman

David A. Holdeman 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: 4836999
    Abstract: Oxygen feed to a Claus plant is controlled by calibrating a hydrocarbon-representative response signal, but not a hydrogen sulfide representative response signal, responsive to the ratio of hydrogen sulfide:sulfur dioxide in effluent from the Claus plant.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: June 6, 1989
    Assignee: Amoco Corporation
    Inventors: Robert L. Reed, David A. Holdeman
  • Patent number: 4711357
    Abstract: An automated system and method for transporting and sorting various types of articles, such as parcels and sacks of mail. The system is comprised of a primary conveyor track and a plurality of secondary conveyor tracks which intersect the primary conveyor track at selected locations therealong. Each secondary track has associated therewith a diverter mechanism for diverting selected articles from the primary track to a corresponding secondary track, depending upon the final destinations of the articles. The diverter mechanism includes a diverter arm, which pivots across the primary track to divert selected articles to the corresponding secondary track. The deflecting surface of the diverter arm includes a motor-driven belt, the bottom edge of which is positioned within 1/4 inch of the surface of the track so that articles of irregular shape, such as sacks of mail, do not become trapped between the bottom edge of the diverter arm and the track.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: December 8, 1987
    Assignee: Keith A. Langenbeck
    Inventors: Keith A. Langenbeck, David A. Holdeman