Patents by Inventor Hannu Lehtola

Hannu Lehtola 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 and Apparatus for Producing Plastic Film
    Publication number: 20080224346
    Abstract: A film (5) is extruded from plastic material by means of an extruder. Material is mixed into the plastic (5a) of the plastic film (5) before the extrusion so that cavitation bubbles are formed in the material particles mixed into the plastic (5a) when the plastic film is stretched. The film (5) is orientated by stretching. After the extrusion the plastic film (5) is cooled slowly below the crystallization point of the plastic material before the orientation.
    Type: Application
    Filed: June 5, 2006
    Publication date: September 18, 2008
    Applicant: CONENOR OY
    Inventors: Kari Kirjavainen, Teuvo Arpiainen, Markku Vilkki, Hannu Lehtola