Granted Patent
Utility
US 5,203,461 · App. 07/771,621
Mineral jig apparatus
Inventors:
Raymond A. Hanson, Wayne F. Crockett
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Oct 4, 1991
Inventors
Raymond A. Hanson
Wayne F. Crockett
Assignee (at issue)
R. A. Hanson 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.