Granted Patent
Utility
US 5,158,764 · App. 07/771,971
Dentifrice
Inventors:
Ivan Again, Vera Boyanova, Karin Otto, Matthias Neumuller, Harald Dippmann
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Oct 9, 1991
Inventors
Ivan Again
Vera Boyanova
Karin Otto
Matthias Neumuller
Harald Dippmann
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.