Patents by Inventor John G. Fields

John G. Fields 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).

  • Patent number: 7311677
    Abstract: Reflective apparatus and method by which energy is radiated in divergent fashion from an elongated source and is reflected by a first parabolic reflector as a paraxial beam, focused by a second parabolic reflector onto a hyperbolic reflector and reflectively concentrated by the hyperbolic reflector at a focus at a distance from the source. The system also shields the point from extraneous radiation that would not be concentrated at the point. In one exemplary application, electromagnetic energy radiated from a point or linear source is focused by the multiple reflector system to a very high concentration at a point, for example, within an organism such as a human or animal body.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: December 25, 2007
    Inventors: John G. Fields, Philip A. Dalton
  • Patent number: 5007196
    Abstract: A non-toxic, non-chemical device and system for repelling crawling insects from a structure such as a building and training the insects to go elsewhere includes closely-spaced elongated conductors mounted on an insulating base and having a potential difference applied thereto for providing a insect-stunning short-circuit current of about fifteen microamps. When insects bridge the conductors, they receive a current as a function of their internal resistance. The conductors are mounted via the base along the foundation and about posts and other structures which connect into the building. Preferably, the conductors are also slippery and reflective to assist in repelling and training the insects without bridging the conductors.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: April 16, 1991
    Inventors: Anne L. Saunders, John G. Fields
  • Patent number: 4839984
    Abstract: A non-toxic, non-chemical device and system for repelling crawling insects from a structure such as a building and training the insects to go elsewhere includes closely-spaced elongated conductors mounted on an insulating base and having a potential difference applied thereto for providing a insect-stunning short-circuit current of about fifteen microamps. When insects bridge the conductors, they receive a current as a function of their internal resistance. The conductors are mounted via the base along the foundation and about posts and other structures which connect into the building. Preferably, the conductors are also slippery and reflective to assist in repelling and training the insects without bridging the conductors.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: June 20, 1989
    Inventors: Anne L. Saunders, John G. Fields