Granted Patent
Utility
US 4,892,967 · App. 07/217,217
Citrate esters
Inventors:
Ezekiel H. Hull, Edward P. Frappier
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Jul 11, 1988
Inventors
Ezekiel H. Hull
Edward P. Frappier
Assignee (at issue)
Morflex Chemical Company, 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.