Granted Patent
Utility
US 4,684,430 · App. 06/508,403
Apparatus for fusibly interconnecting thermoplastic pipes
Inventors:
Takayuki Handa, Yasushi Takeuchi, Masumi Kato, Hisazi Seki
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Jun 28, 1983
Inventors
Takayuki Handa
Yasushi Takeuchi
Masumi Kato
Hisazi Seki
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.