Granted Patent
Utility
US 5,523,023 · App. 08/319,994
Water treatment/cleaning composition comprising polyaspartic acid or derivatives thereof and phosphonic acid
Inventors:
Roland Kleinstuck, Hermann Sicius, Torsten Groth, Winfried Joentgen
Patented Case
View Patent ↗
Granted: Jun 4, 1996
Filed: Oct 7, 1994
Inventors
Roland Kleinstuck
Hermann Sicius
Torsten Groth
Winfried Joentgen
Assignee (at issue)
Bayer Aktiengesellschaft
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.