Granted Patent
Utility
US 6,406,612 · App. 09/641,835
Expandable graphite and method
Inventor:
Ronald Greinke
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Aug 18, 2000
Inventor
Ronald Greinke
Assignee (at issue)
GraftTech Inc.
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.