Granted Patent
Utility
US 6,170,891 · App. 09/070,954
Closure for secondary containment pipe
Inventors:
Hector P. Mercado, Joie L. Folkers, Robert Baxter
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: May 1, 1998
Inventors
Hector P. Mercado
Joie L. Folkers
Robert Baxter
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.