Granted Patent
Utility
US 5,183,152 · App. 07/576,912
Humectants in joint compound containers
Inventors:
James L. Zak, Richard E. Smith
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: Sep 4, 1990
Inventors
James L. Zak
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.