Granted Patent
Utility
US 4,530,432 · App. 06/531,701
Screw conveyer
Inventor:
Robert F. Christian
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Sep 13, 1983
Inventor
Robert F. Christian
Assignee (at issue)
Jude Engineering, 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.