Granted Patent
Utility
US 4,929,362 · App. 07/346,103
Calcium phosphate scale control methods
Inventor:
Fu Chen
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: May 2, 1989
Inventor
Fu Chen
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.