Granted Patent
Utility
US 4,874,541 · App. 07/204,861
All-in-one boiler water treatment composition
Inventors:
Lyle H. Steimel, Ronald J. Christensen
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Jun 10, 1988
Inventors
Lyle H. Steimel
Ronald J. Christensen
Assignee (at issue)
Dubois Chemicals, 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.