Granted Patent
Utility
US 5,003,012 · App. 07/540,397
Neutralization of polymeric acid sites
Inventors:
Linda R. Chamberlain, Carl L. Willis
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Jun 18, 1990
Inventors
Linda R. Chamberlain
Carl L. Willis
Assignee (at issue)
SHELL OIL 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.