Granted Patent
Utility
US 6,583,326 · App. 09/970,856
Process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol
Inventors:
Christoph Schwarz, Markus Weber, Uwe Tanger, Hermann-Josef Korte, Jochen Ullrich
Patented Case
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Granted: Jun 24, 2003
Filed: Oct 5, 2001
Inventors
Christoph Schwarz
Markus Weber
Uwe Tanger
Hermann-Josef Korte
Jochen Ullrich
Assignee (at issue)
Phenolchemie GmbH & Co. KG
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.