Granted Patent
Utility
US 6,041,664 · App. 08/849,489
Method and apparatus for continuous, gravimetric metering and mass flow determination of flowable materials
Inventor:
Hans W. Hafner
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Jun 5, 1997
Inventor
Hans W. Hafner
Assignee (at issue)
Pfister 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.