Granted Patent
Utility
US 5,384,102 · App. 08/098,680
Chemical feeder
Inventors:
Richard H. Ferguson, Charles R. Wiedrich
Patented Case
View Patent ↗
Granted: Jan 24, 1995
Filed: Jul 28, 1993
Inventors
Richard H. Ferguson
Charles R. Wiedrich
Assignee (at issue)
PPG Industries, Inc.
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.