Granted Patent
Utility
US 6,823,943 · App. 10/413,491
Strippable collapsed well liner
Inventor:
Bemton Frederick Baugh
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Apr 15, 2003
Inventor
Bemton Frederick Baugh
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.