Granted Patent
Utility
US 5,223,544 · App. 07/860,963
Process for the removal of foreign materials from a post-consumer plyethylene terephthalate feed stream
Inventors:
Eugene J. Burkett, Randy S. Jenks
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Mar 31, 1992
Inventors
Eugene J. Burkett
Randy S. Jenks
Assignee (at issue)
SHELL OIL COMPANY
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.