Patents by Inventor Lev A. Bychkin

Lev A. Bychkin 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).

  • Pressure gauge
    Patent number: D253691
    Type: Grant
    Filed: July 6, 1977
    Date of Patent: December 18, 1979
    Inventors: Zigmund G. Bljumshtein, Lev A. Bychkin, Nikolai S. Ivanshin
  • Pressure gauge
    Patent number: D253811
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: January 1, 1980
    Inventors: Zigmund G. Bljumshtein, Lev A. Bychkin