Patents by Inventor Andrew R. Lang

Andrew R. Lang 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).

  • Diamond identification
    Patent number: 4125770
    Abstract: A method of determining whether a diamond is the same as or different to a known diamond characterized by the steps of producing one or more records of internal defects of the diamond using X-ray topography and comparing the record or records so produced with a similar record or records produced from the known diamond.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: November 14, 1978
    Inventor: Andrew R. Lang