Granted Patent
Utility
US 5,874,397 · App. 08/675,991
Granular detergent builder
Inventors:
Gunther Schimmel, Alexander Tapper, Volker Thewes
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Jul 9, 1996
Inventors
Gunther Schimmel
Alexander Tapper
Volker Thewes
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.