Granted Patent
Utility
US 4,560,721 · App. 06/394,260
Process for preparing an ether solution of polyamic acids and polyimide resins
Inventors:
Anatoli Onopchenko, Edward T. Sabourin, Charles M. Selwitz
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Jul 1, 1982
Inventors
Anatoli Onopchenko
Edward T. Sabourin
Charles M. Selwitz
Assignee (at issue)
Gulf Research & Development Company
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.