Granted Patent
Utility
US 5,116,082 · App. 07/383,015
Electrofusion of electrofusion joint, method of confirming state of fusion and fusion joint suitable for use in the methods
Inventors:
Takayuki Handa, Naotake Uda
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Jul 21, 1989
Inventors
Takayuki Handa
Naotake Uda
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.