Granted Patent
Utility
US 4,659,459 · App. 06/756,524
Automated systems for introducing chemicals into water or other liquid treatment systems
Inventors:
Richard P. O'Leary, Davie B. Lawhon
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Jul 18, 1985
Inventors
Richard P. O'Leary
Davie B. Lawhon
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.