Granted Patent
Utility
US 5,879,486 · App. 08/900,991
Methods of manufacturing gypsum board and board made therefrom
Inventors:
John L. Philips, Herman C. Fraley
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jul 25, 1997
Inventors
John L. Philips
Herman C. Fraley
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.