Patents by Inventor Jyrki Kroger

Jyrki Kroger 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).

  • Dielectric cellular electret film and procedure for its manufacture
    Patent number: 6852402
    Abstract: Film of dielectric material, which film contains gas bubbles preferably of a flat shape. To achieve improved electrical properties, the film is given a large internal unipolar charge, which is created by charging the film by means of an electric field intensive enough to produce partial discharges in the gas bubbles and to cause the charges to move into the dielectric material of the film.
    Type: Grant
    Filed: January 11, 2001
    Date of Patent: February 8, 2005
    Assignee: Emfitech Oy
    Inventors: Kari Kirjavainen, Keijo Korhonen, Jyrki Kroger, Lasse Raisanen
  • Dielectric cellular electret film and procedure for its manufacture
    Publication number: 20010024712
    Abstract: Film of dielectric material, which film contains gas bubbles preferably of a flat shape. To achieve improved electrical properties, the film is given a large internal unipolar charge, which is created by charging the film by means of an electric field intensive enough to produce partial discharges in the gas bubbles and to cause the charges to move into the dielectric material of the film.
    Type: Application
    Filed: January 11, 2001
    Publication date: September 27, 2001
    Inventors: Kari Kirjavainen, Keijo Korhonen, Jyrki Kroger, Lasse Raisanen
  • SELF-ADHESIVE FILM AND PROCEDURE FOR ITS MANUFACTURE
    Publication number: 20010010861
    Abstract: Film of dielectric material, self-adhesive by virtue of an electrostatic force, which film contains gas blisters preferably of a flat shape. To achieve an adhesive quality of the film, the film is given a large internal unipolar charge, which is created by charging the film by means of an electric field intensive enough to produce partial discharges in the gas blisters and to cause the charges to move into the dielectric material of the film.
    Type: Application
    Filed: May 6, 1997
    Publication date: August 2, 2001
    Inventors: KARI KIRJAVAINEN, KEIJO KORHONEN, JYRKI KROGER, LASSE RAISANEN