Granted Patent
Utility
US 6,646,016 · App. 10/144,951
Aromatic aldehyde resins and their use as emulsion breakers
Inventors:
Frank Holtrup, Elisabeth Wasmund, Wolfram Baumgärtner, Michael Feustel
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: May 14, 2002
Inventors
Frank Holtrup
Elisabeth Wasmund
Wolfram Baumgärtner
Michael Feustel
Assignee (at issue)
Clariant 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.