Granted Patent
Utility
US 5,147,555 · App. 07/738,080
Methods of controlling scale formation in aqueous systems
Inventors:
J. Michael Brown, John F. McDowell, Kin-Tai Chang
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Jul 30, 1991
Inventors
J. Michael Brown
John F. McDowell
Kin-Tai Chang
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.