Granted Patent
Utility
US 4,286,995 · App. 06/134,701
Mica-free joint compound
Inventors:
Richard E. Smith, William R. Burke
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Mar 27, 1980
Inventors
Richard E. Smith
William R. Burke
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.