Granted Patent
Utility
US 4,560,623 · App. 06/608,121
Specular product of bronze-like tone
Inventors:
Yoshitaka Iwata, Ken Matsuda
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: May 8, 1984
Inventors
Yoshitaka Iwata
Ken Matsuda
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.