Granted Patent
Utility
US 4,421,808 · App. 06/365,991
Wood plank wallcovering system
Inventor:
Daniel A. Winkowski
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Apr 6, 1982
Inventor
Daniel A. Winkowski
Assignee (at issue)
National Gypsum Company
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.