Granted Patent
Utility
US 4,255,259 · App. 06/076,810
Scale inhibition
Inventors:
Chih M. Hwa, Dionisio G. Cuisia
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Sep 18, 1979
Inventors
Chih M. Hwa
Dionisio G. Cuisia
Assignee (at issue)
Chemed Corporation
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.