Granted Patent
Utility
US 6,034,281 · App. 09/198,879
Purification of diethylene glycol monoethyl ether
Inventors:
Charles R. Egedy, Christian C. Clause
Patented Case
View Patent ↗
Granted: Mar 7, 2000
Filed: Nov 24, 1998
Inventors
Charles R. Egedy
Christian C. Clause
Assignee (at issue)
Ferro Corporation
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.