Patents by Inventor Brian P. Allen

Brian P. Allen 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 treatment
    Patent number: 4399364
    Abstract: A method of reducing the color of diamond of type 1b including the steps of exposing the diamond to irradiation capable of causing atomic displacements in the diamond, for example the irradiation may be electron bombardment of energy greater than 300 KeV, followed by heat treating the irradiated diamond at a temperature in the range 1600.degree. C. to 2200.degree. C. under a pressure at which the diamond is crystallographically stable at the temperature used.
    Type: Grant
    Filed: September 15, 1981
    Date of Patent: August 16, 1983
    Inventors: Trevor Evans, Brian P. Allen