Granted Patent
Utility
US 6,630,568 · App. 09/815,583
Method for purification of aromatic polyethers
Inventors:
Norman Johnson, Raul Eduardo Ayala, Thomas Joseph Fyve, Amy Rene Freshour, David Woodruff, Peter D. Phelps, Ganesh Kailasam
Patented Case
View Patent ↗
Granted: Oct 7, 2003
Filed: Mar 23, 2001
Inventors
Norman Johnson
Raul Eduardo Ayala
Thomas Joseph Fyve
Amy Rene Freshour
David Woodruff
Peter D. Phelps
Ganesh Kailasam
Assignee (at issue)
General Electric 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.