Patents by Inventor Tjipke Gerard Klijnstra

Tjipke Gerard Klijnstra 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).

  • Adjustable work platform
    Patent number: D421134
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: February 22, 2000
    Assignee: Altrex B. V.
    Inventor: Tjipke Gerard Klijnstra