Granted Patent
Utility
US 6,451,863 · App. 09/569,743
Use of water-insoluble poly(oxy-1,4-butanediyl)-containing polyoxyalkylene-polysiloxane block copolymers for defoaming aqueous media
Inventors:
Thomas Ebbrecht, Wolfgang Josten, Michael Keup, Stefan Silber, Roland Sucker
Patented Case
View Patent ↗
Granted: Sep 17, 2002
Filed: May 11, 2000
Inventors
Thomas Ebbrecht
Wolfgang Josten
Michael Keup
Stefan Silber
Roland Sucker
Assignee (at issue)
Golschmidt AG
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.