Granted Patent
Utility
US 6,686,833 · App. 10/372,394
Compound acoustic actuator drive circuit and portable information terminal
Inventor:
Chiemi Takahashi
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Feb 25, 2003
Inventor
Chiemi Takahashi
Assignee (at issue)
NEC 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.