Patents by Inventor Gerhard W. Voll

Gerhard W. Voll 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).

  • Semi-concentrating solar energy collector
    Patent number: 4586489
    Abstract: A solar collector of the non-tracking fluid circulating type which is formed of light weight materials and comprises a frame supporting fluid circulating tubes having a light absorber disposed axially therein and lined with retroreflective cube-corners. The tubes are placed in semicircular reflectors and enclosed by a transparent barrier sheet and cover having light anti-reflective coatings.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: May 6, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gerhard W. Voll, Richard L. Weiher
  • High fluorescent efficiency zinc oxide crystals and method of making same
    Patent number: 4181627
    Abstract: Single crystals of zinc oxide which efficiently fluoresce in the near UV due to the radiative recombination of free excitons. Increased efficiency is attributed to treatment of the crystals to optimize the concentration of free excitons by providing donors to compensate an as-grown concentration of acceptors of less than 10 parts per million.
    Type: Grant
    Filed: February 19, 1975
    Date of Patent: January 1, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard L. Weiher, Gerhard W. Voll, Kjell I. Hagemark