Granted Patent
Utility
US 6,207,610 · App. 08/857,491
Compacts based on pyrogenically produced silicon dioxide
Inventors:
Helmfried Krause, Hermanus Gerhardus Jozef Lansink Rotgerink, Thomas Tacke, Peter Panster, Roland Burmeister
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: May 16, 1997
Inventors
Helmfried Krause
Hermanus Gerhardus Jozef Lansink Rotgerink
Thomas Tacke
Peter Panster
Roland Burmeister
Assignee (at issue)
Degussa-Huels 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.