Patents by Inventor Leon I. Feldgun

Leon I. Feldgun 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 of producing cubic boron nitride
    Patent number: 4349517
    Abstract: Disclosed is a method of producing cubic boron nitride, which comprises the steps of subjecting to a pressure of from 40 to 70 kilobars and to a temperature of from 1100.degree. to 2000.degree. C. a charge including hexagonal boron nitride and a conversion initiator selected from the group consisting of alkali and alkaline earth metals and borides of the foregoing metals, doping the charge with crystallohydrate in the form of a compound selected from the group consisting of sulfur-, halogen- or nitrogen-containing salts and their mixtures incorporating at least 5 molecules of crystallization water. According to another embodiment, the aforesaid charge is doped with a member selected from the group consisting of alkali metal hydroxide or alkaline earth metal hydroxide.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: September 14, 1982
    Inventors: Vladislav S. Lysanov, Viktor V. Digonsky, Leon I. Feldgun, Valery M. Davidenko, Nikolai V. Novikov, Alexandr I. Borimsky, Alexandr A. Shulzhenko, Valerian D. Yakimenko, Eduard Y. Dovgal, Vitaly Y. Egorov, Vyacheslav S. Rovsha, Alexei I. Prikhna, Alexandr N. Sokolov