Granted Patent
Utility
US 4,624,809 · App. 06/663,373
Method and apparatus for forming upper steps of a concealed type slide fastener
Inventor:
Yoshitaka Iimura
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Oct 22, 1984
Inventor
Yoshitaka Iimura
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.