Patents by Inventor James D. Hamerslag

James D. Hamerslag 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: 5284568
    Abstract: A readily disposable ion selective electrode assembly, free of onboard reagents, for use in analyzers has a reference element and plural sensor elements linearly positioned in parallel on a substrate. An elastomeric flow channel member containing two parallel grooves creates flow channels on the substrate above the elements. The substrate holds the elastomer in compression and is retained by snaps injection molded into a housing. Electrical contacts and leakfree fluidic connections are provided by spring loaded connectors through the housing. Reference and sample fluids are drawn through the respective flow channels and come together to form a liquid junction downstream from the sensor elements. Bubbles, that might otherwise cause erroneous results, are detected.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: February 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Salvatore J. Pace, James D. Hamerslag
  • Patent number: 4865410
    Abstract: A fiber optic device is provided with a feedthrough assembly adapted to decouple deflections imposed on the feedthrough from lensed end of a fiber disposed within the feedthrough assembly.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: September 12, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Calixto Estrada, James D. Hamerslag, Robert W. Hooley, John W. Hunt, Melvin H. Johnson, Duncan D. McCabe, Joseph A. Perrotto
  • Patent number: 4854659
    Abstract: An optical transmitter assembly (1) comprises an optical source (20) and an optical detector (20) arranged to receive light output from the source (10) indirectly via a reflector (30). The source (10), the detector (20), and the reflector (30) are mounted on a common support structure (40). A unitized light reflector assembly (70) having the reflector (30) and detector (20) on a ceramic plate (72) is also disclosed.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: August 8, 1989
    Assignee: BT&D Technologies, Ltd.
    Inventors: James D. Hamerslag, Robert W. Musk