Granted Patent
Utility
US 5,307,669 · App. 08/117,545
Method for testing a waterproof casing
Inventor:
Etsuro Nishio
Patented Case
View Patent ↗
Granted: May 3, 1994
Filed: Sep 7, 1993
Inventor
Etsuro Nishio
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
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.