Patents by Inventor Bernard Hoppitt

Bernard Hoppitt 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).

  • Electrostatic filter and method of filtering dust
    Patent number: 5540756
    Abstract: An electrostatic filter of a combination of a layer of filter material having electrostatic properties and a layer of filter medium without electrostatic properties. The medium is a lofted material arranged to retain particles in the sub-micron and lower micron ranges, and in use, is located upstream of the material. The invention also includes a method of filtering dust from the atmosphere utilizing the electrostatic filter.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: July 30, 1996
    Inventors: Bernard Hoppitt, Bo Engvall