Granted Patent
Utility
US 5,117,191 · App. 07/560,722
Apparatus for monitoring degradation of insulation of electrical installation
Inventors:
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama, Akio Sera, Fukuso Terunaga
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Jul 31, 1990
Inventors
Akira Saigo
Shigenari Maezawa
Tomoaki Kageyama
Akio Sera
Fukuso Terunaga
Assignee (at issue)
Mitsui Petrochemical Industries, 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.