Granted Patent
Utility
US 4,239,700 · App. 06/041,360
Isatoic anhydride derivatives and use as chain-extenders
Inventors:
Edward T. Marquis, Ernest L. Yeakey
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: May 22, 1979
Inventors
Edward T. Marquis
Ernest L. Yeakey
Assignee (at issue)
Texaco Development 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.