Granted Patent
Utility
US 5,998,909 · App. 09/011,177
Piezoelectric transformer
Inventors:
Katsunori Kumasaka, Masafumi KATSUNO, Koichi Okamoto, Yoshiaki Fuda
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Feb 22, 1998
Inventors
Katsunori Kumasaka
Masafumi KATSUNO
Koichi Okamoto
Yoshiaki Fuda
Assignee (at issue)
TOKIN 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.