Patents by Inventor Stefan P. Minchev

Stefan P. Minchev 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).

  • Apparatus for hydromechanical cleaning and polishing
    Patent number: 4660326
    Abstract: An apparatus, consisting of a movable casing connected to a drive mechanism. A chamber is arranged in the movable casing and filled with working medium. The movable casing has a diaphragm connected with a mechanism for backward and forward movement. The movable casing is horizontal and the diaphragm, of which there is at least one, is mounted in the chamber of the movable casing on a sliding coupling. The working medium is a mixture of spheres and working fluid, and the movable casing is connected with a working fluid source.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: April 28, 1987
    Assignee: N P S P PO Hydroplastichna Obrabotka na Metalite
    Inventors: Georgi K. Petkov, Bencho P. Kyurkchiev, Valentin Y. Barzakov, Stefan P. Minchev