Patents by Inventor Per Hasselstrom

Per Hasselstrom 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: 4966818
    Abstract: This invention relates to a method to consolidate a metal powder body to a completely dense body, in which a plate capsule consisting of a cylindrical wall and in one end thereof an end plate is charged with said powder so that the powder completely or essentially completely will fill the capsule, whereafter the air optionally is evacuated from the capsule and optionally replaced with a non-oxidizing protective gas, said capsule thereafter being closed also in the opposite end by an end plaate, whereafter the capsule with its content is heated to a forging temperature suitable for the metal powder and is forged so that the powder is consolidated to a completely dense body.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: October 30, 1990
    Assignee: Uddeholm Tooling Aktiebolag
    Inventors: Bertil Johansson, Per Hasselstrom
  • Patent number: 4747999
    Abstract: A method of powder metallurgically manufacturing an article with near net shape is disclosed, the method comprisingfilling the mould cavity (3) of an open ceramic open mould (1), the inside walls of the cavity being precision copying cast surfaces (2), with fine particulate metal powder (5),placing the mould with its content of metal powder in an outer mould (6), and covering the ceramic open mould containing the metal powder with a bed of finely distributed particulate pressure medium (7),heating the bed of pressure medium and ceramic mould and particulate metal powder therein and subjecting the particulate pressure medium to pressure provided by at least one surface acting in an axial direction against the opening (4) of the ceramic mould, so that pressure is transferred by the particulate pressure medium to the metal powder in the mould to consolidate the metal powder to a completely dense body (21) with surfaces (22) which have been shaped by the precision cast surfaces of the mould cavity.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: May 31, 1988
    Assignee: Uddeholm Tooling Aktiebolag
    Inventor: Per Hasselstrom
  • Patent number: 4723999
    Abstract: A method of powder metallurgically manufacturing an object is disclosed, whereinplacing a first powder (4) selected from the group consisting of a metal powder, a mixture of metal powders, a metal alloy powder, a metal alloy mixture, a mixture of metal powder or metal alloy powder and fibres, particulate ceramic materials, and or other particulate material, and mixtures thereof, in an open mould (1),embedding the mould filled with first powder in a powdered pressure medium (8) made of a material which has a melting point less than the melting point of said first powder or less than the melting point of a component in said first powder which has the lowest melting point, said pressure medium essentially not evaporating at the consolidation temperature of said first powder,melting and pressure medium,raising the temperature of the first powder to a temperature between the liquidus and solidus temperatures of the metal or alloy from which the first powder is manufactured, or, if the first powder is a mixture of
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: February 9, 1988
    Assignee: Uddeholm Tooling Aktiebolag
    Inventor: Per Hasselstrom