Granted Patent
Utility
US 4,780,937 · App. 07/150,506
Fluid-tight slide fastener
Inventor:
Masahiro Kusayama
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Feb 1, 1988
Inventor
Masahiro Kusayama
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.