Granted Patent
Utility
US 5,797,638 · App. 08/822,489
Hoist apparatus for annular member
Inventors:
Masakazu Yamazaki, Michio Yanaba, Hiroaki Taguchi, Takashi Atami, Hisashi Furuya
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Mar 24, 1997
Inventors
Masakazu Yamazaki
Michio Yanaba
Hiroaki Taguchi
Takashi Atami
Hisashi Furuya
Assignees (at issue)
Mitsubishi Materials Silicon Corp.
MITSUBISHI MATERIALS 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.