Granted Patent
Utility
US 6,722,144 · App. 09/682,664
Cylindrical airflow damper
Inventor:
Ronald Miles Johnson
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Oct 3, 2001
Inventor
Ronald Miles Johnson
Assignee (at issue)
General Electric 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.