Granted Patent
Utility
US 5,130,199 · App. 07/658,010
Flexible graphite expandable seal and method
Inventor:
Ronald A. Howard
Patented Case
View Patent ↗
Granted: Jul 14, 1992
Filed: Feb 20, 1991
Inventor
Ronald A. Howard
Assignee (at issue)
UCAR Carbon Technology Corporation
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.