Granted Patent
Utility
US 5,000,821 · App. 07/198,325
Apparatus for controlling solid particle flow in an evaporator
Inventor:
Joseph Bostjancic
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: May 25, 1988
Inventor
Joseph Bostjancic
Assignee (at issue)
Resources Conservation, 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.