Granted Patent
Utility
US 4,845,138 · App. 07/182,161
Freeze-thaw stable polyacrylamide emulsions
Inventors:
Peter M. Robinson, Philip D. Raby, Nguyen Van-Det
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Apr 15, 1988
Inventors
Peter M. Robinson
Philip D. Raby
Nguyen Van-Det
Assignee (at issue)
Exxon Chemical Patents, 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.