Granted Patent
Utility
US 6,486,358 · App. 10/144,887
Process for the purification and formulation of o-phthalaldehyde
Inventors:
Karlheinz Giselbrecht, Walter Raml, Rudolf Hermanseder
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: May 15, 2002
Inventors
Karlheinz Giselbrecht
Walter Raml
Rudolf Hermanseder
Assignee (at issue)
DSM Fine Chemicals Austria NFG 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.