Granted Patent
Utility
US 5,851,502 · App. 08/673,136
Precipitated silica
Inventors:
Gunter Turk, Gerold Schmidt, Mustafa Siray, Karl Meier
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Jul 1, 1996
Inventors
Gunter Turk
Gerold Schmidt
Mustafa Siray
Karl Meier
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.