Patents by Inventor Czeslawa Zielinski

Czeslawa Zielinski 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).

  • Precast concrete stairway module
    Patent number: 4248020
    Abstract: A precast concrete stairway module comprising a concrete wall assembly which is C-shaped in plan view, providing a side wall and two end walls, a concrete stair flight extending from an edge of one side wall to a mid-height position of the other side wall. The stair flight assembly is moulded integrally with the wall assembly and comprises a landing at each end and a flight of stairs therebetween. An access opening is provided in the wall assembly.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: February 3, 1981
    Assignee: Canadian Patents & Development Ltd.
    Inventors: Zenon A. Zielinski, Czeslawa Zielinski