Patents by Inventor Leland E. Ashman

Leland E. Ashman 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 means of rapidly distnguishing a simulated diamond from natural diamond
    Patent number: 4364677
    Abstract: A simulated diamond such as crystalline cubic zirconia, which has optical properties very similar to natural diamond and so is difficult to distinguish optically from natural diamond, is distinguished from natural diamond by measuring its thermal conductivity which is significantly different from the thermal conductivity of natural diamond, by measuring the temperature of a heated probe held against the simulated diamond as an indication of the simulated diamond thermal conductivity. In a preferred embodiment of the present invention, a controlled amount of heat energy is generated at the probe and thereafter, while the probe is held against the simulated diamond, the temperature of the probe is detected as a measure of relative thermal conductivity of the simulated diamond to the natural diamond.
    Type: Grant
    Filed: March 3, 1981
    Date of Patent: December 21, 1982
    Assignee: Ceres Electronics Corporation
    Inventor: Leland E. Ashman
  • Method and means of rapidly distinguishing a simulated diamond from natural diamond
    Patent number: 4255962
    Abstract: A simulated diamond such as crystalline cubic zirconia, which has optical properties very similar to natural diamond and so is difficult to distinguish optically from natural diamond, is distinguished from natural diamond by measuring its thermal conductivity which is significantly different from the thermal conductivity of natural diamond, by measuring the temperature of a heated probe held against the simulated diamond as an indication of the simulated diamond thermal conductivity. In a preferred embodiment of the present invention, a controlled amount of heat energy is generated at the probe and thereafter, while the probe is held against the simulated diamond, the temperature of the probe is detected as a measure of relative thermal conductivity of the simulated diamond to the natural diamond.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: March 17, 1981
    Assignee: Ceres Corporation
    Inventor: Leland E. Ashman