Granted Patent
Utility
US 4,667,702 · App. 06/899,170
Trim-to-length duct
Inventor:
James Edward Roth
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Aug 22, 1986
Inventor
James Edward Roth
Assignee (at issue)
Intertherm Inc.
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.