Granted Patent
Utility
US 4,824,736 · App. 07/099,966
Gasoline tank of tin-free (electroplate chrome-chrome oxide coated) steel coated with a maleic anhydride modified polypropylene
Inventors:
Raymond J. Ehrig, Richard C. Weil
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Sep 23, 1987
Inventors
Raymond J. Ehrig
Richard C. Weil
Assignee (at issue)
Aristech Chemical Company
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.