Patents by Inventor Mannes Grendelman

Mannes Grendelman 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).

  • Pipe part provided with a flange
    Patent number: 4330016
    Abstract: A fiber reinforced plastic pipe is provided with an integral flange, comprising circumferentially extending glass fiber fabrics. As the width of the fabrics exceeds the width of the finished flange, the fabrics are provided with inwardly bent parts at one or both side walls of the flange, or with undulating parts.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: May 18, 1982
    Assignee: Wavin B.V.
    Inventor: Mannes Grendelman
  • Fiber reinforced plastic pipe part
    Patent number: 4217935
    Abstract: A method of manufacturing a fiber reinforced plastic pipe part, comprising a first wall part and a wall part adjoining the latter through an inner rounded corner transition having a radius of curvature of less than 5 mm, preferably 0,5 to 3 mm.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: August 19, 1980
    Assignee: Wavin B.V.
    Inventors: Mannes Grendelman, Mattheus J. Poiesz, Leo A. A. van der Kemp