Patents by Inventor Warner J. Putter

Warner J. Putter 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 pipe comprising an outer corrugated pipe and a smooth inner wall
    Patent number: 5060696
    Abstract: A plastic pipe consisting of an outer corrugated plastic pipe and an inner smooth wall consisting of a wear resistant elastomer, particularly a thermoplastic rubber fixed in the inner bottoms wave valleys to said outer corrugated pipe. The inner wall consists of a pipe which has been coextruded with the outer corrugated pipe so that the inner and outer pipe are heat welded to each other.The cavities between the inner pipe and the corrugations may be filled with a foam plastic.This plastic pipe is used for repairing or renewing a sewage pipe by installing such a pipe from a vertical shaft of the sewage system into the sewage pipes. The interstices between the outer side of the corrugations and the inner side of the sewage pipe may be filled with a mortar.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: October 29, 1991
    Assignee: Wavin, BV
    Inventor: Warner J. Putter