Patents by Inventor Nikolai A. Dmitriev

Nikolai A. Dmitriev 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).

  • Process for fine purification of sulphur hexafluoride from impurities
    Patent number: 4380532
    Abstract: The present invention relates to the production of high-purity substances and, more specifically, to a process for a fine purification of sulphur hexafluoride from impurities.The process for a fine purification of sulphur hexafluoride comprises purification of sulphur hexafluoride by crystallization at a speed of displacement of the interphase boundary of from 1 to 50 mm/hr at a temperature of from 222.3 to 217.degree. K.; the liquid-phase concentrate formed during crystallization is subjected to sublimation purification under a pressure of from 210 to 1.3-0.13 KPa.The high-purity sulphur hexafluoride is useful in the high-voltage energetics as an insulation and arc-exctinguishing medium, as well as in electronics, laser engineering, metallurgy and medicine.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: April 19, 1983
    Inventors: Igor M. Mazurin, Mikhail L. Netupsky, Alexandr V. Shevtsov, Viktor T. Gladky, Nikolai A. Dmitriev, Andrei G. Lyapin, Alexandr V. Polyakov, Mikhail A. Myshev, Vladimir V. Panov