Granted Patent
Utility
US 4,495,328 · App. 06/601,909
Crystalline copolyamides from terephthalic acid and hexamethylenediamine and trimethylhexamethylenediamine
Inventors:
Wassily Poppe, Yu-Tsai Chen, Larry W. Autry
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Apr 19, 1984
Inventors
Wassily Poppe
Yu-Tsai Chen
Larry W. Autry
Assignee (at issue)
Standard Oil Company (Indiana)
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.