Patents by Inventor Steinar Spydevold

Steinar Spydevold 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).

  • Process for the production of products of light cellular plastic with closed cells
    Patent number: 5667740
    Abstract: A process for the production of products of light cellular plastic with closed cells from a plastic composition containing chemical blowing agent and, optionally, other process-regulative substances and additives, where the plastic composition is processed (kneaded) mechanically in a plastic processing machine to a well homogenized, melted plastic compound, and that the plastic compound is then pressed into a closed cavity, at a temperature above the decomposition temperature for the chemical blowing agent in the plastic compound, in combination with possible decomposition regulative additives.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: September 16, 1997
    Assignee: Polynor Partners A/S
    Inventor: Steinar Spydevold