Granted Patent
Utility
US 4,280,706 · App. 06/104,343
Seal for fluidizing outlet
Inventor:
Frederick E. Vorwerk
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: Dec 17, 1979
Inventor
Frederick E. Vorwerk
Assignee (at issue)
ACF Industries Incorporated
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.