Patents by Inventor Robert Keul

Robert Keul 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).

  • Neutral bronze glazings
    Patent number: 4190452
    Abstract: A neutral bronze sheet glass has a dominant wavelength in the vicinity of 575 nm, and a monochromatic transmittance which in the range from about 400 nm to about 550 nm is on the average from about 5% to about 50% lower than in the range from about 550 nm to about 750 nm, and possesses in thicknesses suitable for glazing a luminous transmittance above 70%.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: February 26, 1980
    Assignee: Saint-Gobain Industries
    Inventors: Klaus Fischer, Robert Keul
  • Neutral bronze glazings
    Patent number: 4101705
    Abstract: A neutral bronze sheet glass has a dominant wavelength in the vicinity of 575 nm, and a monochromatic transmittance which in the range from about 400 nm to about 550 nm is on the average from about 5 to about 50% lower than in the range from about 550 nm to about 750 nm, and possesses in thicknesses suitable for glazing a luminous transmittance above 70%.
    Type: Grant
    Filed: December 2, 1975
    Date of Patent: July 18, 1978
    Assignee: Saint-Gobain Industries
    Inventors: Klaus Fischer, Robert Keul