Granted Patent
Utility
US 6,026,862 · App. 08/806,123
Double containment pipe sections
Inventors:
Ralph Friedrich, Joie L. Folkers, Brian M. Francis
Patented Case
View Patent ↗
Granted: Feb 22, 2000
Filed: Feb 14, 1997
Inventors
Ralph Friedrich
Joie L. Folkers
Brian M. Francis
Assignee (at issue)
AMERON INTERNATIONAL CORPORATION
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.