Patents by Inventor Andrzej J. Szulc

Andrzej J. Szulc 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).

  • Patent number: 5287716
    Abstract: A method and hand powered tool for forming openings in metal wall-studs thereby to receive electrical cables, which can be easily pulled through these openings. The tool comprises pyramidally shaped piercer attached to a jaw which is pivotally connected to a handle having affixed hollow die. The piercer, pushed into stud's wall by lever, forms in the stud an opening having guiding tabs shaped from material displaced from the area of said opening.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: February 22, 1994
    Inventor: Andrzej J. Szulc