Granted Patent
Utility
US 6,149,972 · App. 09/015,590
Expandable graphite and method
Inventor:
Ronald Greinke
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Jan 29, 1998
Inventor
Ronald Greinke
Assignee (at issue)
UCAR Graph-Tech 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.