Granted Patent
Utility
US 4,420,378 · App. 06/304,671
Method for forming decorative colored streak patterns on the surface of an aluminum shaped article
Inventors:
Masatake Tsuboi, Hatsuo Hirono, Kazuo Aikawa
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Sep 22, 1981
Inventors
Masatake Tsuboi
Hatsuo Hirono
Kazuo Aikawa
Assignee (at issue)
Yoshida Kogyo K.K.
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.