Granted Patent
Utility
US 5,162,153 · App. 07/878,086
Poly(butylene terephthalate) copolyester and a process for preparing it
Inventors:
A. Wayne Cooke, Barrie L. Davies
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: May 4, 1992
Inventors
A. Wayne Cooke
Barrie L. Davies
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.