Granted Patent
Utility
US 4,929,677 · App. 07/165,649
Acetophenone based bisphenol polyarylate resins
Inventors:
Barry D. Dean, Robert G. Gastinger
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Mar 8, 1988
Inventors
Barry D. Dean
Robert G. Gastinger
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.