Granted Patent
Utility
US 4,364,795 · App. 06/293,114
Gypsum wallboard and method for producing same
Inventor:
Arthur E. Kennedy
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Aug 17, 1981
Inventor
Arthur E. Kennedy
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.