Granted Patent
Utility
US 6,721,668 · App. 09/381,037
Vibration exciting apparatus and vibration testing apparatus for structure using same
Inventors:
Yasuyuki Momoi, Toshihiko Horiuchi, Kazuhiro Umekita, Masahiko Inoue, Takao Konno, Masaharu Sugano, Yuuji Tadano
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Dec 2, 1999
Inventors
Yasuyuki Momoi
Toshihiko Horiuchi
Kazuhiro Umekita
Masahiko Inoue
Takao Konno
Masaharu Sugano
Yuuji Tadano
Assignee (at issue)
HITACHI, 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.