Granted Patent
Utility
US 4,279,673 · App. 06/120,566
Hard-edge wallboard
Inventors:
George H. White, Donald J. Petersen
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Feb 11, 1980
Inventors
George H. White
Donald J. Petersen
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.