Granted Patent
Utility
US 6,562,897 · App. 09/674,273
Ether/ester dispersants
Inventor:
Dean Thetford
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Oct 30, 2000
Inventor
Dean Thetford
Assignee (at issue)
Avecia Limited
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.