Granted Patent
Utility
US 4,863,616 · App. 07/153,286
Microbiological control process
Inventors:
Douglas D. Clarkson, Richard P. Clifford, Alan Marshall
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Feb 8, 1988
Inventors
Douglas D. Clarkson
Richard P. Clifford
Alan Marshall
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.