Patents by Inventor David G. Allender

David G. Allender 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).

  • Method of and apparatus for detecting conductive particles in an oil flow system
    Patent number: 4030028
    Abstract: A method and apparatus for sensing the presence and quantity of conductive particles in an oil flow system is disclosed which method and apparatus is based on a novel sensor element comprising a planar array of a plurality of electrically conductive surfaces interconnected with a plurality of series connected resistor elements. Electronic circuitry for use in combination with the sensor element is described. Preferred embodiments of the sensor element and preferred combinations of sensor element and electronic circuitry are disclosed.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: June 14, 1977
    Inventor: David G. Allender
  • Portable electrical resistance sensing wand
    Patent number: D276796
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: December 18, 1984
    Inventor: David G. Allender, Jr.