Patents by Inventor Hendrikus ter Wijlen

Hendrikus ter Wijlen 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 well pipe
    Patent number: 4215727
    Abstract: A plastic well pipe comprising an outer wall, an inner wall, and channels formed by longitudinally extending partitions being integral with the walls, the outer wall being provided with bores opening into the channels, while at certain points the inner wall has been removed for recovering liquid from the channels, which liquid flows into the channels through the bores.
    Type: Grant
    Filed: November 14, 1978
    Date of Patent: August 5, 1980
    Assignee: Wavin B.V.
    Inventor: Hendrikus ter Wijlen