Granted Patent
Utility
US 5,879,446 · App. 08/137,766
Gypsum wallboard, and method of making same
Inventors:
Jashbhai M. Patel, Ronald S. Finkelstein
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Aug 21, 1998
Inventors
Jashbhai M. Patel
Ronald S. Finkelstein
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.