Patents by Inventor Niels I. Ingvorsen

Niels I. Ingvorsen 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).

  • Tongs for arched paving stones
    Patent number: D334325
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: March 30, 1993
    Inventor: Niels I. Ingvorsen
  • Arched paving
    Patent number: D346037
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: April 12, 1994
    Inventor: Niels I. Ingvorsen