Granted Patent
Utility
US 4,671,887 · App. 06/804,140
Aqueous stable suspensions of water insoluble silicates capable of binding calcium ions and their use for the production of washing and cleaning agents
Inventors:
Manfred Diehl, Roland Bergmann, Gunter Stadtmuller, Sigrid Diener
Patented Case
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Granted: Jun 9, 1987
Filed: Dec 3, 1985
Inventors
Manfred Diehl
Roland Bergmann
Gunter Stadtmuller
Sigrid Diener
Assignee (at issue)
Degussa 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.