Granted Patent
Utility
US 4,260,298 · App. 06/040,004
Control of solids discharge from pressurized vessel
Inventor:
Frederick A. Zenz
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: May 17, 1979
Inventor
Frederick A. Zenz
Assignee (at issue)
The Ducon Company, 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.