Patents by Inventor Marek Warcholinski

Marek Warcholinski 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).

  • Method of making a spirally-wound tube
    Patent number: 6939424
    Abstract: This invention concerns a method and an apparatus for making a spirally-wound tube from a hollow thermoplastic profile (1) having a substantially rectangular cross-section, which method comprises the steps of: winding the thermoplastic profile (1) around a drum (2) and joining adjacent loops together by welding, and smoothing the outer weld joint (13) by means of extra heat and a smoothing body resting against the weld joint (13).
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: September 6, 2005
    Assignee: Oy KWH Pipe AB
    Inventors: Seppo Takala, Marek Warcholinski