Granted Patent
Utility
US 5,086,031 · App. 07/507,040
Pressed parts based on pyrogenically produced silicon dioxide, method of their production and their use
Inventors:
Klaus Deller, Martin Forster, Helmfried Krause
Patented Case
View Patent ↗
Granted: Feb 4, 1992
Filed: Apr 10, 1990
Inventors
Klaus Deller
Martin Forster
Helmfried Krause
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.