Patents by Inventor Rolf V. Cederstrom

Rolf V. Cederstrom 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 of treating of layered laminated plastic objects
    Patent number: 5622661
    Abstract: A method of treating laminated objects of plastics that have been damaged by osmosis or the like and which contain liquids and/or gases within laminate layers. Particularly within the damaged area the object is given such a temperature by controlled heating, that liquids are evaporated and gases are expanded in such a manner that covering layers are broken up and the damaged portion is exposed but also in such a manner that the damaged portion is not enduringly heated to a temperature exceeding 300.degree. C. Preferably the heating is combined with exertion of a mechanical force against the object in way to remove the material which has been loosened due to the heating.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: April 22, 1997
    Assignee: Creto (International) Ltd.
    Inventor: Rolf V. Cederstrom