Granted Patent
Utility
US 5,934,712 · App. 08/800,318
Double containment pipe mechanical joints
Inventors:
Ralph Friedrich, Paul Kubat
Patented Case
View Patent ↗
Granted: Aug 10, 1999
Filed: Feb 14, 1997
Inventors
Ralph Friedrich
Paul Kubat
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.