Granted Patent
Utility
US 6,623,649 · App. 09/873,448
Process for removing cyclic acetals from wastewater streams
Inventors:
Hans-Jurgen Bister, Alexander Gammersbach, Axel Gohrt, Joachim Grub, Stefanie Konig
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Jun 5, 2001
Inventors
Hans-Jurgen Bister
Alexander Gammersbach
Axel Gohrt
Joachim Grub
Stefanie Konig
Assignee (at issue)
BP KOLN 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.