Granted Patent
Utility
US 5,366,253 · App. 07/913,632
Electrofusion joint and hot water supply header using the same
Inventors:
Akio Nakashiba, Hiroyuki Nishimura, Fumio Nagatani, Kazunori Mito, Toshio Shibabuchi, Mikio Nakaoka
Patented Case
View Patent ↗
Granted: Nov 22, 1994
Filed: Jul 16, 1992
Inventors
Akio Nakashiba
Hiroyuki Nishimura
Fumio Nagatani
Kazunori Mito
Toshio Shibabuchi
Mikio Nakaoka
Assignees (at issue)
Osaka Gas Co., Ltd.
Mitsui Petrochemical Industries, Ltd.
Shinwa Sangyo Co., 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.