Granted Patent
Utility
US 6,641,688 · App. 09/681,417
Method for sealing an annular space
Inventor:
Stephen V. Gearhart
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Mar 30, 2001
Inventor
Stephen V. Gearhart
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.