Granted Patent
Utility
US 4,197,190 · App. 05/919,223
Process for dehydrating tar and/or hydrocarbon oils
Inventor:
Anthony A. Foster
Patented Case
View Patent ↗
Granted: Apr 8, 1980
Filed: Jun 26, 1978
Inventor
Anthony A. Foster
Assignee (at issue)
KOPPERS, INC.
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.