Patents by Inventor Alvan Gilbertson

Alvan Gilbertson 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).

  • Apparatus and method for providing spot lighting for gemstone observation
    Patent number: 7436497
    Abstract: An apparatus, system and method for providing spot lighting for observing a gemstone is presented. In particular, the spot lighting provided by the invention allows for observing of the fire of a gemstone, i.e. the visible effects of light dispersion into separate colors. The apparatus includes a tube for receiving a portion of a multi-spectral light source, and a mask coupled to the tube for blocking other portions of the light source. By selecting the proper tube dimensions and aligning the tube with both the light source at an inlet and a gemstone at an outlet, the spot lighting source provides direct lighting for isolating and accentuating the effects of fire.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: October 14, 2008
    Assignee: Gemological Institute of America
    Inventors: Mary L. Johnson, Alvan Gilbertson, David Rosenthal
  • Apparatus and method for providing spot lighting for gemstone observation
    Patent number: 7088434
    Abstract: An apparatus, system and method for providing spot lighting for observing a gemstone is presented. In particular, the spot lighting provided by the invention allows for observing of the fire of a gemstone, i.e. the visible effects of light dispersion into separate colors. The apparatus includes a tube for receiving a portion of a multi-spectral light source, and a mask coupled to the tube for blocking other portions of the light source. By selecting the proper tube dimensions and aligning the tube with both the light source at an inlet and a gemstone at an outlet, the spot lighting source provides direct lighting for isolating and accentuating the effects of fire.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: August 8, 2006
    Assignee: Gemological Institute of America, Inc.
    Inventors: Mary L. Johnson, Alvan Gilbertson, David Rosenthal
  • Apparatus and method for providing spot lighting for gemstone observation
    Publication number: 20060164624
    Abstract: An apparatus, system and method for providing spot lighting for observing a gemstone is presented. In particular, the spot lighting provided by the invention allows for observing of the fire of a gemstone, i.e. the visible effects of light dispersion into separate colors. The apparatus includes a tube for receiving a portion of a multi-spectral light source, and a mask coupled to the tube for blocking other portions of the light source. By selecting the proper tube dimensions and aligning the tube with both the light source at an inlet and a gemstone at an outlet, the spot lighting source provides direct lighting for isolating and accentuating the effects of fire.
    Type: Application
    Filed: March 21, 2006
    Publication date: July 27, 2006
    Inventors: Mary Johnson, Alvan Gilbertson, David Rosenthal
  • Apparatus and method for providing spot lighting for gemstone observation
    Publication number: 20050036131
    Abstract: An apparatus, system and method for providing spot lighting for observing a gemstone is presented. In particular, the spot lighting provided by the invention allows for observing of the fire of a gemstone, i.e. the visible effects of light dispersion into separate colors. The apparatus includes a tube for receiving a portion of a multi-spectral light source, and a mask coupled to the tube for blocking other portions of the light source. By selecting the proper tube dimensions and aligning the tube with both the light source at an inlet and a gemstone at an outlet, the spot lighting source provides direct lighting for isolating and accentuating the effects of fire.
    Type: Application
    Filed: August 13, 2003
    Publication date: February 17, 2005
    Inventors: Mary Johnson, Alvan Gilbertson, David Rosenthal