Granted Patent
Utility
US 4,937,321 · App. 06/542,813
Process for preparing poly((benzo(1,2-D:5,4-D')bisthiazole-2,6-diyl)-1,4-phenylene
Inventor:
James E. Kuder
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Oct 17, 1983
Inventor
James E. Kuder
Assignee (at issue)
Hoechst Celanese Corporation
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.