Granted Patent
Utility
US 5,616,679 · App. 08/549,776
Polyalkylene glycol
Inventors:
Matthias Fies, Roland Gr utzmacher, Alfred Westfechtel
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Nov 14, 1995
Inventors
Matthias Fies
Roland Gr utzmacher
Alfred Westfechtel
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.