Granted Patent
Utility
US 4,628,651 · App. 06/761,618
Fire-retardant wall
Inventors:
Mario P. Morettin, Richard A. Costolnick
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Aug 1, 1985
Inventors
Mario P. Morettin
Richard A. Costolnick
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.