Patents by Inventor William H. Webster

William H. Webster 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).

  • Urine pH indicator system and associated methods
    Patent number: 6162646
    Abstract: A urine pH indicator has a plurality of hydrophilic, non-ionic, polymer foam carrier particles. The carrier particles are impregnated with an indicator complex having more than one chromophore and indicating more than one pH threshold via at least three distinguishable colors. The carrier particles are preferable chopped and soaked in a solution containing the chromophore complex. Upon evaporation of the solvent, the chromophore complex is bound to the carrier particles which can then be spread upon animal litter to receive urine and indicate pH via color display.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: December 19, 2000
    Assignee: William H. Webster
    Inventors: William H. Webster, Alfred E. Fox
  • Apparatus for removing and installing valve-spring retainer assemblies and for testing the tension of springs employed thereby
    Patent number: 5339515
    Abstract: Apparatus and method for removing, installing and/or testing valve-spring retainer assemblies of internal combustion engines and the like employ an existing spark plug opening to mount a tool which is designed to depress a valve spring and thereby disengage an associated valve-spring retainer assembly. Once it has been disengaged, at least a portion of the valve-spring retainer assembly can be removed from a cylinder head of the engine through the tool.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: August 23, 1994
    Inventors: Douglas C. Brackett, William H. Webster