Patents by Inventor Herbert Leckie Mitchell

Herbert Leckie Mitchell 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).

  • Nephelometer instrument for measuring turbidity of water
    Patent number: 7663751
    Abstract: The specific wavelength of 525 nm is described as a single monochromatic light source used in the determination of turbidity by nephelometry at 90° for particulate matter in raw water, water treatment, waste water treatment and industrial process streams. This wavelength improves the detection of smaller particle concentration in water where light scattering characteristics of shorter wavelengths are superior to light sources using longer wavelengths.
    Type: Grant
    Filed: February 10, 2009
    Date of Patent: February 16, 2010
    Inventor: Herbert Leckie Mitchell
  • Nephelometric turbidity sensor device
    Patent number: 7659980
    Abstract: Describes a nephelometric turbidity sensor device which embodies: methods for: (a) attenuation of entrained air, (b) attenuation of bubbles, (c) attenuation of scattered light (d) interchangeable light sources with automatic indexing of algorithms (e) anti-fog windows and (f) verification of operation by self-check and (g) self-calibration.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: February 9, 2010
    Inventors: Herbert Leckie Mitchell, Steven Henry Mersch