Granted Patent
Utility
US 4,863,991 · App. 07/142,469
Filled composition comprising crystalline copolyamide from terephthalic acid, isophthalic acid and hexamethylene diamine
Inventors:
Wassily Poppe, Yu-Tsai Chen, Edward E. Paschke
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Jan 11, 1988
Inventors
Wassily Poppe
Yu-Tsai Chen
Edward E. Paschke
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.