Granted Patent
Utility
US 4,988,909 · App. 07/465,897
Piezoelectric element with giant electrostrictive effect and ceramic composition for preparing same
Inventors:
Atsushi Hagimura, Mutsuo Nakajima
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Jan 16, 1990
Inventors
Atsushi Hagimura
Mutsuo Nakajima
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.