Granted Patent
Utility
US 4,931,206 · App. 07/313,642
Boiler water treatment composition
Inventors:
Alexander C. McDonald, James L. Soos
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Feb 21, 1989
Inventors
Alexander C. McDonald
James L. Soos
Assignee (at issue)
Betz Laboratories, 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.