Granted Patent
Utility
US 4,877,595 · App. 07/155,709
Method of compressing pyrogenically prepared silicic acid
Inventors:
Reinhard Klingle, Reinhard Manner
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Feb 16, 1988
Inventors
Reinhard Klingle
Reinhard Manner
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.