Patents by Inventor Douwe Gaastra

Douwe Gaastra 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).

  • Grumment for sail cloth
    Patent number: 3935619
    Abstract: A grumment for sail cloth in which two rings are positioned around the edge of a hole therein which edge has been ravelled and has a thermosetting adhesive smeared thereon and tightly clamped against the edge by a torus-shaped collar enclosing the rings.
    Type: Grant
    Filed: March 31, 1975
    Date of Patent: February 3, 1976
    Assignee: Gaastra B.V.
    Inventor: Douwe Gaastra