Granted Patent
Utility
US 6,265,608 · App. 09/107,401
Method of purifying aromatic dicarboxylic acids
Inventors:
Charles Edwan Sumner, Jr., Brent Alan Tennant
Patented Case
View Patent ↗
Granted: Jul 24, 2001
Filed: Jun 30, 1998
Inventors
Charles Edwan Sumner, Jr.
Brent Alan Tennant
Assignee (at issue)
Eastman Chemical 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.