Granted Patent
Utility
US 4,469,312 · App. 06/472,991
Melting furnace of a rigid structure
Inventors:
Koichi Konda, Shoji Shinohara
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Mar 7, 1983
Inventors
Koichi Konda
Shoji Shinohara
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.