Granted Patent
Utility
US 5,718,797 · App. 08/594,484
Apparatus for manufacturing gypsum board
Inventors:
John L. Phillips, Herman C. Fraley
Patented Case
View Patent ↗
Granted: Feb 17, 1998
Filed: Jan 31, 1996
Inventors
John L. Phillips
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.