Patents by Inventor Patrick M. Wiese

Patrick M. Wiese 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).

  • Detection of free chlorine in water
    Patent number: 8065906
    Abstract: The present invention describes methods and kits for determining the concentration of free chlorine in water. To avoid false readings from other species present in the water, the free chlorine is reacted with ammonia to form monochloramine, which is then reacted to form an indophenol or an indonaphthol. The concentration of the indophenol or indonaphthol is proportional to the total monochloramine present. Subtracting the concentration of residual monochloramine from the total monochloramine yields the concentration of monochloramine formed from the free chlorine and ammonia, and is proportional to the concentration of free chlorine. Embodiments of the present invention will simplify and accelerate accurate measurements of free chlorine in water, without interference from compounds impacting present measurements of free chlorine.
    Type: Grant
    Filed: June 18, 2009
    Date of Patent: November 29, 2011
    Assignee: Hach Company
    Inventor: Patrick M. Wiese
  • DETECTION OF FREE CHLORINE IN WATER
    Publication number: 20090320570
    Abstract: The present invention describes methods and kits for determining the concentration of free chlorine in water. To avoid false readings from other species present in the water, the free chlorine is reacted with ammonia to form monochloramine, which is then reacted to form an indophenol or an indonaphthol. The concentration of the indophenol or indonaphthol is proportional to the total monochloramine present. Subtracting the concentration of residual monochloramine from the total monochloramine yields the concentration of monochloramine formed from the free chlorine and ammonia, and is proportional to the concentration of free chlorine. Embodiments of the present invention will simplify and accelerate accurate measurements of free chlorine in water, without interference from compounds impacting present measurements of free chlorine.
    Type: Application
    Filed: June 18, 2009
    Publication date: December 31, 2009
    Applicant: Hach Company
    Inventor: Patrick M. Wiese
  • Lead extraction and analysis
    Patent number: 5019516
    Abstract: Techniques are described for extracting lead from a sample of potable water and analyzing for the amount of lead so extracted. A complexing agent is added to the water to form a complex with the lead. The water is then contacted with unmodified cellulosic or siliceous material on which the lead complex is retained. The complexed lead can be removed from the cellulosic or siliceous material with a weak acid. The amount of lead in the sample can be readily determined colorimetrically.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: May 28, 1991
    Assignee: Hach Company
    Inventor: Patrick M. Wiese