Granted Patent
Utility
US 4,853,462 · App. 07/171,334
Preparation of discrete particles of polyalkylene carbonate
Inventors:
Donald E. Hostetler, Michael J. Cannarsa, Haven S. Kesling, Jr., Hsiang-Ning Sun
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Mar 21, 1988
Inventors
Donald E. Hostetler
Michael J. Cannarsa
Haven S. Kesling, Jr.
Hsiang-Ning Sun
Assignee (at issue)
Arco Chemical Technology, L.P.
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.