Granted Patent
Utility
US 4,861,855 · App. 07/032,740
Polyamide-imide compositions from bisphenoxyphenyl diamine tricarboxylic anhydride and tetracarboxylic dianhydride
Inventors:
Ronald E. Bockrath, Bill W. Cole
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Mar 31, 1987
Inventors
Ronald E. Bockrath
Bill W. Cole
Assignee (at issue)
Amoco 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.