Patents by Inventor C. R. Smith

C. R. Smith 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 and apparatus for mounting and faceting gemstones
    Patent number: 5085011
    Abstract: Apparatus for grinding or polishing flat facets of gemstones comprising a mirror lap wheel base adapted to be mounted to a rotary drive and a lap film adapted to be mounted flushly upon the mirror lap wheel base.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: February 4, 1992
    Inventor: C. R. Smith
  • Method of faceting gemstones
    Patent number: 4980995
    Abstract: A flat facet is polished with a lap film mounted to the lap last used in prepolishing. In this manner lap surface irregularities and plane angle are maintained. This has been discovered to avoid the creation of scratches in the facet.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: January 1, 1991
    Inventor: C. R. Smith
  • Method and apparatus for mounting and faceting gemstones
    Patent number: 4864778
    Abstract: Gemstones are positioned for adherence to a faceting machine dop with apparatus that includes a transparent, target bearing base and x-y centering bars. A mirror lap wheel is also disclosed to which a lap film is mounted after flush facet contact with the transparent base is observed.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: September 12, 1989
    Inventor: C. R. Smith