Patents by Inventor Edward F. Schaack

Edward F. Schaack 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).

  • Stairway apparatus and method of manufacture
    Patent number: 4893442
    Abstract: Stair apparatus and method of manufacture, wherein the stair apparatus has concrete tread pads and landings which are poured and set during manufacture so that pouring and setting of the concrete does not have to be done in the field, thereby saving much labor and time. The method includes a unique step of clamping the step elements between the stringer elements so that the step elements are firmly held in proper position during welding thereof to the stringer elements. The landings are supported in a novel manner in a stairwell, and the stair assemblies are supported between the landings.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: January 16, 1990
    Assignee: Duraflite, Inc.
    Inventors: James M. Graham, Edward F. Schaack
  • Stairway apparatus and method of manufacture
    Patent number: 4838005
    Abstract: Stair apparatus and method of manufacture, wherein the stair apparatus has concrete tread pads and landings which are poured and set during manufacture so that pouring and setting of the concrete does not have to be done in the field, thereby saving much labor and time. The method includes a unique step of clamping the step elements between the stringer elements so that the step elements are firmly held in proper position during welding thereof to the stringer elements. The landings are supported in a novel manner in a stairwell, and the stair assemblies are supported between the landings.
    Type: Grant
    Filed: November 13, 1986
    Date of Patent: June 13, 1989
    Assignee: Duraflite, Inc.
    Inventors: James M. Graham, Edward F. Schaack