Granted Patent
Utility
US 5,962,041 · App. 08/888,039
Dual flexible lip extrusion apparatus
Inventors:
John W. Ryan, Vernon J. Krupa, Gregory M. Wilson, Donald R. Garton, Harry G. Lippert
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Jul 3, 1997
Inventors
John W. Ryan
Vernon J. Krupa
Gregory M. Wilson
Donald R. Garton
Harry G. Lippert
Assignee (at issue)
Extrusion Dies, 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.