Granted Patent
Utility
US 6,004,383 · App. 09/150,063
Membrane dryer for drying moist air with valved scavenger duct
Inventor:
Herbert Kuhnelt
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Sep 9, 1998
Inventor
Herbert Kuhnelt
Assignees (at issue)
Hygrama AG
ULTRATROC GmbH
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.