Granted Patent
Utility
US 5,158,685 · App. 07/729,519
Inhibition of silica and silicate deposition in cooling water systems
Inventor:
Donald T. Freese
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Jul 12, 1991
Inventor
Donald T. Freese
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.