Patents by Inventor Gilbert N. Ravich

Gilbert N. Ravich 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).

  • Gem identification viewer
    Patent number: 6650489
    Abstract: A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: November 18, 2003
    Assignee: Gemological Institute of America, Inc.
    Inventors: Gilbert N. Ravich, Shane Elen, James Shigley
  • Gem identification viewer
    Publication number: 20020180952
    Abstract: A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.
    Type: Application
    Filed: July 17, 2002
    Publication date: December 5, 2002
    Inventors: Gilbert N. Ravich, Shane Elen, James E. Shigley
  • Gem identification viewer
    Publication number: 20020008925
    Abstract: A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.
    Type: Application
    Filed: August 16, 2001
    Publication date: January 24, 2002
    Applicant: Gemological Institute of America, Inc.
    Inventors: Gilbert N. Ravich, Shane Elen, James E. Shigley
  • Gem identification viewer
    Patent number: 6292315
    Abstract: A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: September 18, 2001
    Assignee: Gemological Institute of America, Inc.
    Inventors: Gilbert N. Ravich, Shane Elen, James Shigley