Granted Patent
Utility
US 4,609,750 · App. 06/744,469
Siloxanes with betaine groups, their synthesis and use in hair care products
Inventors:
Hans-Joachim Kollmeier, Rolf-Dieter Langenhagen, Klaus Hoffmann
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jun 13, 1985
Inventors
Hans-Joachim Kollmeier
Rolf-Dieter Langenhagen
Klaus Hoffmann
Assignee (at issue)
Th. Goldschmidt. AG
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.