Granted Patent
Utility
US 4,846,147 · App. 07/105,709
Chimney liner system
Inventors:
Donald M. Townsend, John R. Jacklich
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Oct 5, 1987
Inventors
Donald M. Townsend
John R. Jacklich
Assignee (at issue)
Simpson Dura-Vent Company, 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.