Granted Patent
Utility
US 6,004,457 · App. 09/052,649
Temporary silt guard for sewer inlet
Inventor:
Roger Singleton
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Mar 31, 1998
Inventor
Roger Singleton
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.