Granted Patent
Utility
US 6,688,072 · App. 10/355,918
Cover for riser section and method of using cover for anchoring riser section in concrete
Inventor:
Norman W. Gavin
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Jan 31, 2003
Inventor
Norman W. Gavin
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.