Granted Patent
Utility
US 6,831,052 · App. 10/062,101
Cleaning compositions containing hydroxy mixed ethers, methods of preparing the same, and uses therefor
Inventors:
Manfred Weuthen, Hans-Christian Raths, Michael Elsner
Patented Case
View Patent ↗
Granted: Dec 14, 2004
Filed: Jan 31, 2002
Inventors
Manfred Weuthen
Hans-Christian Raths
Michael Elsner
Assignee (at issue)
Cognis Deutschland GmbH
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.