Granted Patent
Utility
US 4,609,721 · App. 06/747,211
Process for making molding grade polyethylene terephthalate
Inventors:
Gerald S. Kirshenbaum, Michael Goldin, W. Alan Case
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jun 21, 1985
Inventors
Gerald S. Kirshenbaum
Michael Goldin
W. Alan Case
Assignee (at issue)
Celanese GmbH
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.