Granted Patent
Utility
US 6,357,327 · App. 09/487,356
Method of cutting metal pipe and its apparatus
Inventors:
Masayoshi Usui, Fumihiko Shiozaki, Fujio Watanabe
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Jan 19, 2000
Inventors
Masayoshi Usui
Fumihiko Shiozaki
Fujio Watanabe
Assignee (at issue)
USUI KOKUSAI SANGYO KAISHA LIMITED
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.