Granted Patent
Utility
US 6,485,821 · App. 09/512,921
Gypsum-based construction material
Inventors:
Robert Bruce, David M. Harriss
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Feb 25, 2000
Inventors
Robert Bruce
David M. Harriss
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.