Granted Patent
Utility
US 5,590,641 · App. 08/461,431
Adaptor for installing flue liners to direct vent fireplace inserts
Inventor:
Luu Q. Duong
Patented Case
View Patent ↗
Granted: Jan 7, 1997
Filed: Jun 5, 1995
Inventor
Luu Q. Duong
Assignee (at issue)
CFM International 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.