Patents by Inventor Leonid Fedorovich Vereschagin

Leonid Fedorovich Vereschagin 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 polycrystalline diamond aggregates
    Patent number: 4089933
    Abstract: A method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape, after which, in the presence of a catalyst taken in the form of a powder whose envelope surrounds the carbon-containing material, said material is subjected to the action of pressure and simultaneous heating by an electric current pulse with a duration of 0.1 to 10.0 sec.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: May 16, 1978
    Assignee: Institut Fiziki Vysokikh Daleny Akademi Nauk, SSSR
    Inventors: Leonid Fedorovich Vereschagin, Evgeny Nikolaevich Yakovlev, Tatyana Dmitrievna Varfolomeeva, Alexandr Yakovlevich Preobrazhensky, Vladislav Nikolaevich Slesarev, Vasily Alexandrovich Stepanov, Ljudmila Efimovna Shterenberg
  • Process for producing synthetic diamonds
    Patent number: 4085196
    Abstract: A process for producing synthetic diamonds which comprises the synthesis of diamonds from a charge consisting of graphite or a carbonaceous material capable of being graphitized and a catalyst; as the latter use is made of a metalgraphite laminar compound of a transition metal, wherein said metal is interposed between the graphite layers and chemically bonded therewith.Said catalyst makes it possible to shorten the duration of the synthesis down to several seconds and carry-out the synthesis at a temperature of below 1,200.degree. C. The resulting diamond crystals are colorless and transparent.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: April 18, 1978
    Inventors: Vladimir Ivanovich Farafontov, Yaroslav Alexeevich Kalashnikov, Jury Nikolaevich Novikov, Mark Efimovich Volpin, Leonid Fedorovich Vereschagin, Vladislav Sergeevich Lysanov
  • Method of producing polycrystalline diamonds
    Patent number: 4049783
    Abstract: A method of producing polycrystalline diamonds which is characterized by providing a thermal contact of the reaction chamber with the cooled members of the device developing a high pressure and high temperatures for removing the heat generated within this chamber in the process of crystallization of a diamond, which method is also characterized in that the cross-sectional area of the metal-catalyst is not more than 0.04 that of the reaction chamber in a plane normal to the direction of the maximum withdrawal of the heat of crystallization. Said metal-catalyst is set in the carbon-containing material substantially in the center of the reaction chamber.
    Type: Grant
    Filed: January 2, 1973
    Date of Patent: September 20, 1977
    Inventors: Leonid Fedorovich Vereschagin, Evgeny Nikolaevich Yakovlev, Tatyana Dmitrievna Varfolomeeva, Alexandr Yakovlevich Preobrazhensky, Vladislav Nikolaevich Slesarev, Vasily Alexandrovich Stepanov, Ljudmila Efimovna Shterenberg
  • Method for producing polycrystalline diamond aggregates of predetermined shape
    Patent number: 3949062
    Abstract: A workpiece made of a non-diamond carbonaceous material and having dimensions exceeding those of a polycrystalline diamond aggregate by a contraction coefficient value of the non-diamond material during its transformation into a polycrystalline diamond material, is enclosed with a powder-like catalyst having particle dimensions less than the minimum dimensions of the workpiece, subjected to a pressure of at least 80 kb, and heated by a pulse of electric current for a period of 0.1 to 10 seconds sufficient for the formation of said polycrystalline aggregate.
    Type: Grant
    Filed: December 27, 1972
    Date of Patent: April 6, 1976
    Inventors: Leonid Fedorovich Vereschagin, Alexandr Yakovlevich Preobrazhensky, Vasily Alexandrovich Stepanov, Valentin Semenovich Voblikov