Patents by Inventor Andre Stil

Andre Stil 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).

  • Hydropneumatic accumulator
    Patent number: 4852615
    Abstract: A hydropneumatic accumulator including a metal sheet casing and an elastomer membrane which separates the inside of the casing into a first chamber containing a pressurized gas and a second chamber containing a liquid, this membrane being fixed to the casing by a cup, in which a sheet metal disk is cold deformed in two operations, namely a first operation for obtaining a cylindrical or conical blank, one end of which has a convex bottom and provided with an orifice for filling the first chamber with gas, and a second operation in which, after the membrane has been fixed in the casing by means of the cup, the cylindrical part of the blank is hammered so as to give it a spherical shape with an axial orifice in which a connection is crimped and welded for feeding liquid into the second chamber, wherein said cup is fixed to the bottom of the casing by irremovable means and the first deformation operation is carried out so that the blank has a form such that the membrane may be engaged between it and the cup, clam
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: August 1, 1989
    Assignees: Automobiles Peugeot, Automobiles Citroen
    Inventor: Andre Stil
  • Method of producing a hydropneumatic accumulator
    Patent number: 4800642
    Abstract: A method for manufacturing a hydropneumatic accumulator including a metal sheet casing and an elastomer membrane which separates the inside of the casing into a first chamber containing a pressurized gas and a second chamber containing a liquid, this membrane being fixed to the casing by a cup, in which method a sheet metal disk is cold deformed in two operations, namely a first operation for obtaining a cylindrical or conical blank, one end of which has a convex bottom and provided with an orifice for filling the first chamber with gas, and a second operation in which, after the membrane has been fixed in the casing by means of the cup, the cylindrical part of the blank is hammered so as to give it a spherical shape with an axial orifice in which a connection is crimped and welded for feeding liquid into the second chamber, wherein said cup is fixed to the bottom of the casing by irremovable means and the first deformation operation is carried out so that the blank has a form such that the membrane may be en
    Type: Grant
    Filed: July 30, 1987
    Date of Patent: January 31, 1989
    Assignees: Automobiles Peugeot, Automobiles Citroen
    Inventor: Andre Stil