Granted Patent
Utility
US 4,321,182 · App. 06/260,652
Stable non-corrosive solution of polybenzimidazole suitable for use in the formation of shaped articles
Inventors:
Robert E. Davitt, Jr., Gordon Calundann, Edward C. Chenevey
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: May 4, 1981
Inventors
Robert E. Davitt, Jr.
Gordon Calundann
Edward C. Chenevey
Assignee (at issue)
Celanese GmbH
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.