Patents Assigned to Spectrex Corporation
  • Method and apparatus for visualizing particles suspended in a fluid
    Patent number: 6646741
    Abstract: Apparatus and method for direct visualization of particles suspended in a fluid medium include a source of a collimated beam of light that illuminates a sample volume of particles and reference volume of particles of a selected size and density. Light scattered from the particles is viewed directly along an axis skewed from the beams for comparatively assessing approximate particle size and density in the sample volume.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: November 11, 2003
    Assignee: Spectrex Corporation
    Inventor: John M Hoyte
  • Particulate counter
    Patent number: 4623252
    Abstract: A particulate counter determines the size, number and distribution by size of various particles within a vessel by the principle of near angle scattering in which the portion of a light beam which is deflected by a given particle indicates detection and sizing of that particle. The counter disregards sidelobes which are caused by interference between the deflected portion of the beam and the beam itself by allowing only a single valid particle detection to occur in the space of a given time window.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: November 18, 1986
    Assignee: Spectrex Corporation
    Inventor: Keith E. Hollenbeck
  • Method and means for continuously sampling a fluid
    Patent number: 4237451
    Abstract: An improved air-sampling pump of miniature size ideally suited for carrying on a person includes monitoring circuitry which controls motive pump-energizing signal applied to an air pump to ensure that sampled air is pumped through a test chamber at a substantially constant rate over an extended period of time and also includes alarm circuitry which provides comtemporary and residual indications of interrupted flow rate during the sampling period.
    Type: Grant
    Filed: February 9, 1979
    Date of Patent: December 2, 1980
    Assignee: Spectrex Corporation
    Inventor: Keith E. Hollenbeck