Patents by Inventor Nils Hjelte

Nils Hjelte 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).

  • Publication number: 20090145189
    Abstract: The present invention discloses a method of producing an aqueous solution of partially deprotonated aminopolycarboxylic acid from a partially or fully deprotonated aminopolycarboxylic acid. Additionally it discloses such aqueous solutions and their use.
    Type: Application
    Filed: June 19, 2008
    Publication date: June 11, 2009
    Inventor: Nils Hjelte
  • Patent number: 6082405
    Abstract: A valve cone comprises a cylindrical body extending along a longitudinal axis. The body has a cylindrical surface with at least one, axially extending recess. The recess extends inside a contour line between a first end position at a first end of the cylindrical body and a second end position, which is located between the first end of the body and the opposite second end of the body. The cross-sectional area of the recess, in a plane perpendicular to its longitudinal axis, gradually decreases from a maximum value close to the said first end towards the second end position. A valve cone of the type described above is arranged in a valve. In a method for manufacturing the valve cone, the radial recesses are formed by cutting in a single axial-radial cutting motion.
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: July 4, 2000
    Assignee: Tac AB
    Inventors: Patrik Qvarfordh, Jonas Wall, Nils Hjelte, Goran Dahl, Christer Hernrup