Granted Patent
Utility
US 4,589,237 · App. 06/606,081
Stair module support and leveling construction
Inventor:
Donald E. Dahowski
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: May 1, 1984
Inventor
Donald E. Dahowski
Assignee (at issue)
Quaker Plastic Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.