Granted Patent
Utility
US 4,773,556 · App. 06/460,490
Aqueous joint compound seal
Inventor:
Richard E. Smith
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Jan 24, 1983
Inventor
Richard E. Smith
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.