Granted Patent
Utility
US 5,111,573 · App. 07/687,064
Device and method of exchanging tools
Inventors:
Yasushi Ito, Tamio Otani, Tadanori Dobashi, Akira Irie, Akihiro Matsuya
Patented Case
View Patent ↗
Granted: May 12, 1992
Filed: Apr 18, 1991
Inventors
Yasushi Ito
Tamio Otani
Tadanori Dobashi
Akira Irie
Akihiro Matsuya
Assignee (at issue)
Hitachi Seiko Ltd.
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.