Granted Patent
Utility
US 4,981,521 · App. 07/192,011
Sprayable fireproofing composition
Inventors:
Robert J. Bettacchi, Mary E. Driscoll, Dennis M. Hilton
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: May 9, 1988
Inventors
Robert J. Bettacchi
Mary E. Driscoll
Dennis M. Hilton
Assignee (at issue)
W.R. Grace & Co. Conn.
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.