Granted Patent
Utility
US 4,223,148 · App. 06/070,805
Polyalkyl-piperidine diols and process for their preparation
Inventor:
Hartmut Wiezer
Patented Case
View Patent ↗
Granted: Sep 16, 1980
Filed: Aug 29, 1979
Inventor
Hartmut Wiezer
Assignee (at issue)
Hoechst GmbH
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.