Granted Patent
Utility
US 4,370,167 · App. 06/358,264
Asbestos-free drywall joint compound utilizing sepiolite clay as asbestos substitute
Inventor:
Patrick J. Mudd
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Mar 15, 1982
Inventor
Patrick J. Mudd
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.