Granted Patent
Utility
US 4,706,344 · App. 06/921,528
Button assembly
Inventors:
Akira Tanaka, Hirokazu Watanabe
Patented Case
View Patent ↗
Granted: Nov 17, 1987
Filed: Oct 22, 1986
Inventors
Akira Tanaka
Hirokazu Watanabe
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.