Granted Patent
Utility
US 4,351,796 · App. 06/213,144
Method for scale control
Inventor:
Alan Marshall
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Dec 4, 1980
Inventor
Alan Marshall
Assignee (at issue)
Ciba-Geigy
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.