Granted Patent
Utility
US 4,433,022 · App. 06/333,715
Three-dimensional ceiling board facing
Inventors:
William C. Schwartz, Paul Blalock
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Dec 23, 1981
Inventors
William C. Schwartz
Paul Blalock
Assignee (at issue)
Burlington Industries LLC
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.