Patents by Inventor Leonardus H. M. Beukers

Leonardus H. M. Beukers 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).

  • Plastic bag comprising venting means
    Patent number: 4441209
    Abstract: A plastic bag provided with a filling valve and a gas permeable dust filtering pocket opposite said valve, allowing gas to escape from the interior of the bag.A disconnectable spot adhesive connection exists between a layer of said pocket and the adjacent bag wall parts opposite a corner flap. An additional adhesive or welding connection may be present near the free end of the pocket for connecting the layer with the bottom flaps.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: April 3, 1984
    Assignee: Wavin B.V.
    Inventors: Willem Lunshof, Leonardus H. M. Beukers