Granted Patent
Utility
US 5,047,306 · App. 07/354,121
Humidity tolerant charge director compositions
Inventor:
Yaacov Almog
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: May 19, 1989
Inventor
Yaacov Almog
Assignee (at issue)
Spectrum Sciences B.V.
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.