Granted Patent
Utility
US 5,219,614 · App. 07/873,703
Method for lining pipe inner surface in multibranch piping
Inventors:
Masato Kawazoe, Takaharu Tomoyasu
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Apr 22, 1992
Inventors
Masato Kawazoe
Takaharu Tomoyasu
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.