Patents by Inventor Matheus Johannes Martinus Coppens

Matheus Johannes Martinus Coppens 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).

  • Screw threaded plastic plug
    Patent number: 3944114
    Abstract: A plug of plastic or other soft material to be screwed into a metal neck, with means for preventing the possibility of screwing in the plug obliquely. The means comprises a cone-shaped bevel around the first thread of the plug, the top angle of the bevelling cone corresponding to the top angle of the reamer used to ream the entry of the neck screw thread.
    Type: Grant
    Filed: March 14, 1975
    Date of Patent: March 16, 1976
    Assignee: Koninklijke Emballage Industrie Van Leer B.V.
    Inventor: Matheus Johannes Martinus Coppens