Patents by Inventor Maiya K. Doncheva

Maiya K. Doncheva 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).

  • Patent number: 4777817
    Abstract: A press tool comprising a bottom plate onto which there are mounted a die with radial grooves and a profiled ejector inserted into the die and circularly oriented in it so that the grooves of the die and the ejector coincide, and over them, by means of guiding columns and guiding sleeves, there are mounted a top plate with a rigid insert attached to its bottom side, a rest and a punch-holder with radial grooves, in which there are fastened prismatic punches and a central core, and underneath the punch-holder there is provided a punch-guide, fastened to the guiding columns by means of guiding sleeves.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: October 18, 1988
    Assignee: D S O "ELPROM"
    Inventors: Peter H. Parashikov, Borislav A. Yonchev, Milko H. Hristov, Alexander K. Alexandrov, Velcho N. Georgiev, Maiya K. Doncheva, Nikola D. Fishekov, Ivan G. Venkov, Chavdar D. Hristov