Granted Patent
Utility
US 5,256,166 · App. 07/368,122
Terpolymer of ethylene, vinyl acetate and isobutylene useful as pour point depressants in distillate oils
Inventor:
Joseph Fischer
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Jun 16, 1989
Inventor
Joseph Fischer
Assignee (at issue)
National Distillers and Chemical Corporation
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.