Granted Patent
Utility
US 5,620,744 · App. 08/582,968
Method of preventing corrosion in concrete pipe
Inventors:
Fred R. Huege, Timothy L. Salter
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Jan 4, 1996
Inventors
Fred R. Huege
Timothy L. Salter
Assignee (at issue)
Chemical Lime Company
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.