Granted Patent
Utility
US 4,631,097 · App. 06/356,977
Embossed gypsum board
Inventor:
Donald A. Kossuth
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Mar 11, 1982
Inventor
Donald A. Kossuth
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.