Patents by Inventor Robert D. Stream

Robert D. Stream 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).

  • System for verifying the calibration of a turbidimeter
    Patent number: 5912737
    Abstract: A system is described for verifying the calibration of a turbidimeter having a light source and a detector for scattered light. A first polarizer is positioned in the path of the light beam, and a second polarizer is positioned between the first polarizer and the detector. The first polarizer linearly polarizes the light beam and the second polarizer restricts the amount of light passing through it to reach the detector.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: June 15, 1999
    Assignee: Hach Company
    Inventors: Ashim K. Bannerjee, Robert D. Stream
  • Bubble elimination from liquid
    Patent number: 5831727
    Abstract: Apparatus and a method are described for eliminating gas bubbles from a moving liquid stream. The apparatus includes a plurality of chambers having an open top. Each chamber directs the moving liquid stream upwardly through an area of reduced diameter and then downwardly to an opening into an adjacent chamber. The bubbles are thereby urged upwardly to the top of the liquid where they burst and are vented to the atmosphere. The apparatus and method are especially useful, for example, in a turbidimeter.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: November 3, 1998
    Assignee: Hach Company
    Inventor: Robert D. Stream
  • Nephelometer instrument
    Patent number: 5604590
    Abstract: A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: February 18, 1997
    Assignee: Hach Company
    Inventors: Richard J. Cooper, Kevin A. Keilbach, Richard P. Kolman, Ernie R. Paoli, Kenneth L. Stutzman, Robert D. Stream
  • Nephelometer instrument
    Patent number: 5506679
    Abstract: A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: April 9, 1996
    Assignee: Hach Company
    Inventors: Richard J. Cooper, Kevin A. Keilbach, Richard P. Kolman, Ernie R. Paoli, Kenneth L. Stutzman, Robert D. Stream
  • Subgingival delivery tip for attachment to dental irrigation instruments
    Patent number: D304231
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: October 24, 1989
    Assignee: Teledyne Industries, Inc.
    Inventor: Robert D. Stream
  • Portable colorimeter
    Patent number: D336444
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: June 15, 1993
    Assignee: Hach Company
    Inventors: Mark E. Anderson, Richard J. Cooper, Robert D. Stream
  • Laboratory nephelometer
    Patent number: D363676
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: October 31, 1995
    Assignee: Hach Company
    Inventors: Mark E. Anderson, Richard J. Cooper, Ernie R. Paoli, Robert D. Stream
  • Filter holder for laboratory turbidimeter
    Patent number: D363682
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: October 31, 1995
    Assignee: Hach Company
    Inventor: Robert D. Stream
  • Turbidimeter
    Patent number: D402768
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: December 15, 1998
    Assignee: Hach Company
    Inventors: Ernie R. Paoli, Robert D. Stream