Granted Patent
Utility
US 5,591,497 · App. 08/603,496
Chlorinated polyvinyl chloride rigid pipe and method of forming such pipe
Inventor:
Joachim E. Hartitz
Patented Case
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Granted: Jan 7, 1997
Filed: Feb 20, 1996
Inventor
Joachim E. Hartitz
Assignee (at issue)
B. F. Goodrich 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.