Patents by Inventor Helmut Buerger

Helmut Buerger 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 for determining a high-reflection cut of a gem, method for cutting a high-reflection gem, and the cut high-reflection gem
    Patent number: 6474102
    Abstract: The invention relates to a method for determining a high-reflection cut of a gem, a method for cutting a high-reflection gem, and a cut high-reflection gem. According to the invention, the gems have at least three lower part main facets and at least three upper part main facets, the angle between the lower part main facets and the girdle plane being greater than the angle between the upper part main facets and the girdle plane. A table replaces the upper part main facets at an angle of 0°. The lower part main facet angle is between 41° and 46° and the upper part main facet angle corresponds to an angle from a group of predetermined preferred angles. The group of angles is determined according to the average refraction of light n (between 1.50 and 3.00) of the raw material being cut and the lower part main facet angle.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: November 5, 2002
    Inventor: Helmut Buerger