Granted Patent
Utility
US 4,354,885 · App. 06/273,587
Hard-edge wallboard
Inventor:
George H. White
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Jun 15, 1981
Inventor
George H. White
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.