Granted Patent
Utility
US 4,929,711 · App. 07/416,903
Process for converting polyketones to polyesters
Inventors:
Biau-Hung Chang, Lester Y. Lee, Jack Kwiatek
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Oct 4, 1989
Inventors
Biau-Hung Chang
Lester Y. Lee
Jack Kwiatek
Assignee (at issue)
Quantum Chemical 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.