Granted Patent
Utility
US 4,402,757 · App. 06/319,901
Method of vibrating coiled wires
Inventors:
Heijiro Kawakami, Katsumasa Tanaka, Seiichi Kamamoto, Kazuo Sato
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Nov 10, 1981
Inventors
Heijiro Kawakami
Katsumasa Tanaka
Seiichi Kamamoto
Kazuo Sato
Assignee (at issue)
KOBE STEEL, 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.