Granted Patent
Utility
US 5,821,381 · App. 08/792,049
Low pressure process for purifying crude polyester by sublimation
Inventor:
Andrius A. Naujokas
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Feb 3, 1997
Inventor
Andrius A. Naujokas
Assignee (at issue)
EASTMAN KODAK 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.