Patents by Inventor Georgy Frolov

Georgy Frolov 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).

  • Door closer piston assembly having separate head portions
    Patent number: 4665583
    Abstract: A hydraulic door closer has a housing including a bore and a piston supported for reciprocal sliding movement within the bore in door opening and closing directions corresponding, respectively, to opening and closing movements of an associated door. The piston has a head at one end and an open opposite end which receives a portion of a spring which biases the piston in its door closing direction. First and check second check valves within the head comprise part of a fluid control system for checking movement of the piston during at least a portion of its travel in either its door opening or door closing direction.
    Type: Grant
    Filed: April 1, 1986
    Date of Patent: May 19, 1987
    Assignee: Emhart Industries, Inc.
    Inventors: Georgy Frolov, Walter E. Surko, Jr.