Granted Patent
Utility
US 6,056,997 · App. 08/987,672
Corrosion protection in concrete sanitary sewers
Inventor:
Thomas M. Miller
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Dec 9, 1997
Inventor
Thomas M. Miller
Assignee (at issue)
PSC Technologies GmbH
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.