Granted Patent
Utility
US 4,201,746 · App. 05/806,139
Apparatus for zone refining
Inventors:
John W. Burd, Bobbie D. Stone, William F. Tucker, Kedar P. Gupta
Patented Case
View Patent ↗
Granted: May 6, 1980
Filed: Jun 13, 1977
Inventors
John W. Burd
Bobbie D. Stone
William F. Tucker
Kedar P. Gupta
Assignee (at issue)
Monsanto Company
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.