Granted Patent
Utility
US 5,140,097 · App. 07/608,128
Thermoplastic thermosettable polyamide from poly(oxytetramethylene) diamine and poly(oxytetramethylene) oligomer polyamine
Inventors:
George P. Speranza, Wei-Yang Su, Robert L. Zimmerman, Donald H. Champion
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Nov 1, 1990
Inventors
George P. Speranza
Wei-Yang Su
Robert L. Zimmerman
Donald H. Champion
Assignee (at issue)
Texaco Chemical Inc.
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.