Granted Patent
Utility
US 6,136,417 · App. 09/181,659
Corrugator and corrugated fiberboard sheet manufacturing method
Inventors:
Hiroshi Ishibuchi, Hiroyuki Takenaka, Yukuharu Seki, Makoto Ando
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Oct 29, 1998
Inventors
Hiroshi Ishibuchi
Hiroyuki Takenaka
Yukuharu Seki
Makoto Ando
Assignee (at issue)
MITSUBISHI ELECTRIC CORPORATION
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.