Granted Patent
Utility
US 4,874,540 · App. 07/092,686
Graft copolymers of a polyether moiety on a polycarboxylate backbone
Inventors:
Richard B. Greenwald, Chung-Tsing Liu, James A. McDonell
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Sep 3, 1987
Inventors
Richard B. Greenwald
Chung-Tsing Liu
James A. McDonell
Assignee (at issue)
ECOLAB 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.