Granted Patent
Utility
US 5,378,571 · App. 08/039,021
Aryl and aralkyl sulfide, sulfoxide or sulfone compounds as charge regulators
Inventors:
Hans-Tobias Macholdt, Gert Nagl
Patented Case
View Patent ↗
Granted: Jan 3, 1995
Filed: Apr 2, 1993
Inventors
Hans-Tobias Macholdt
Gert Nagl
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.