Granted Patent
Utility
US 4,833,225 · App. 07/154,964
Polyquaternary polysiloxane polymers, their synthesis and use in cosmetic preparations
Inventors:
Dietmar Schaefer, Manfred Krakenberg
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Feb 10, 1988
Inventors
Dietmar Schaefer
Manfred Krakenberg
Assignee (at issue)
Th. Goldschdidt 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.