Granted Patent
Utility
US 5,031,944 · App. 07/540,706
Apparatus for blocking release of slide fastener
Inventor:
Keiichi Keyaki
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Jun 20, 1990
Inventor
Keiichi Keyaki
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.