Granted Patent
Utility
US 6,081,985 · App. 09/139,613
Method of inserting corner members in channel-shaped flanges of a duct
Inventors:
Herbert Fischer, Michael E. Satterfield
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: Aug 25, 1998
Inventors
Herbert Fischer
Michael E. Satterfield
Assignee (at issue)
Engel Industries, 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.