Granted Patent
Utility
US 4,828,622 · App. 07/191,808
Process for preparing highly concentrated aqueous press cakes of solids
Inventors:
Joachim Weide, Erwin Dietz, Reinhold Deubel
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: May 5, 1988
Inventors
Joachim Weide
Erwin Dietz
Reinhold Deubel
Assignee (at issue)
Hoechst 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.