Granted Patent
Utility
US 5,202,157 · App. 07/749,336
Method for lining internal surfaces of pipelines
Inventors:
Takaharu Tomoyasu, Kanji Miyamoto
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Aug 23, 1991
Inventors
Takaharu Tomoyasu
Kanji Miyamoto
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.