Granted Patent
Utility
US 4,638,542 · App. 06/623,116
Method and apparatus for forming element-free spaces in slide fastener chains
Inventors:
Hideki Akiyama, Shigeru Imai
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Jun 22, 1984
Inventors
Hideki Akiyama
Shigeru Imai
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.