Granted Patent
Utility
US 4,581,870 · App. 06/407,138
Paper battens
Inventor:
Daniel A. Winkowski
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Aug 11, 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.