Granted Patent
Utility
US 4,786,017 · App. 07/096,251
High temperature-resistant fibrous silicon dioxide material
Inventors:
Arno Wegerhoff, Hans-Dieter Achtsnit
Patented Case
View Patent ↗
Granted: Nov 22, 1988
Filed: Sep 9, 1987
Inventors
Arno Wegerhoff
Hans-Dieter Achtsnit
Assignee (at issue)
Akzo N.V.
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.