Granted Patent
Utility
US 5,248,756 · App. 07/824,129
Crystallization agent for bisphenol-A polycarbonate
Inventors:
Chih-Chien Hsu, Gerhard Guenther, Richele T. Howelton, David E. Bergbreiter, Alan Letton, Pei-Hua Wang
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Jan 22, 1992
Inventors
Chih-Chien Hsu
Gerhard Guenther
Richele T. Howelton
David E. Bergbreiter
Alan Letton
Pei-Hua Wang
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.