Granted Patent
Utility
US 4,989,841 · App. 07/338,837
Metal continuously melting and retaining furnace
Inventors:
Kenzo Tokumasu, Katsuo Taki, Ryotatsu Ootsuka, Masaaki Nakamura, Tatsuo Akino
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Apr 14, 1989
Inventors
Kenzo Tokumasu
Katsuo Taki
Ryotatsu Ootsuka
Masaaki Nakamura
Tatsuo Akino
Assignees (at issue)
Honda Foundry Co., Ltd.
Taisei Furnace Ind. Co., Ltd.
Showa Aluminum Corp.
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.