Patents by Inventor Ivan Dimov

Ivan Dimov 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).

  • Method of and apparatus for fluid die stamping
    Patent number: 4049041
    Abstract: A system for the die stamping of a fluid comprises a male die member which s forced into a die cavity to compress and spread the fluid material therein. A piston in this die member is advanced after the die member is arrested by a shoulder of the female die member to compress gas ahead of this piston and increase the pressure at selected locations along the face of the male member at which cavities are provided to communicate this gas pressure to the fluid.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: September 20, 1977
    Assignee: Institute po Metalosnanie i Technologia na Metalite pri Ban
    Inventors: Ivan Dimov Nikolov, Hristo Georgiev Kortenski, Dimiter Tanev Dimitrov, Asparuh Mihaylov Antonov
  • Method for controlling the rate of filling of casting molds
    Patent number: 3961662
    Abstract: A method of controlling the rate of filling of a casting mold wherein a pressure P.sub.1 is applied to a chamber containing a crucible holding the molten material to be cast, a pressure P.sub.2 is provided in a chamber containing the mold, the mold is connected with the crucible by a tube conveying the molten material to the mold, and the molten material is displaced through the tube by a pressure differential .DELTA.p equal to P.sub.1 -P.sub.2, which comprises detecting the time derivatives dP.sub.2 /dt and d.DELTA.P/dt of the pressure in the chamber containing the mold and the pressure differential, respectively. The rate of variation of the pressure in the chamber of the mold is monitored to regulate the process while one of the other derivatives is compared with a set point value to control one of the pressures as a function of time to vary the rate of filling of the mold in accordance with a predetermined program.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: June 8, 1976
    Assignee: Institut po Metaloznanie i Technologia na Metalite
    Inventors: Angel Tonchev Balevski, Ivan Dimov Nikolov, Dragan Iliev Nenov, Emil Nikolov Momchilov
  • Method of injection molding a thermoplastic article having a cellular core and integral skin involving use of reclaimed material
    Patent number: 3960996
    Abstract: A method of and apparatus for the molding of foamed thermoplastic bodies with integral skins wherein, for each mold operation after the first, a portion of previously foamed material produced by expansion in the mold cavity, is temporarily accumulated behind a body of unfoamed thermoplastic and the foamed and unfoamed material are then forced into the mold cavity and permitted to expand therein.
    Type: Grant
    Filed: September 21, 1973
    Date of Patent: June 1, 1976
    Assignee: Institut po Metaloznanie i Technologia na Metalite
    Inventors: Anguel Tonchev Balevski, Ivan Dimov Nikolov, Asparuh Mihailov Antonov, Stefan Georgiev Semerdjiev
  • Device for the production of articles with a compact smooth skin and a cellular core from polymer materials
    Patent number: 3949905
    Abstract: An apparatus for the production of articles with a compact smooth skin and a cellular core from polymer materials, which contain blowing agents, by injection molding or extrusion wherein the apparatus contains an electric heating element within a channel through which the polymeric material is passed.
    Type: Grant
    Filed: June 5, 1974
    Date of Patent: April 13, 1976
    Assignee: Institute po Metaloznanie i Technologia na Metalite
    Inventors: Ivan Dimov Nikolov, Stefan Georgiev Semerdjiev, Dragan Iliev Nenov, Nikolay Tihomirov Popov