Granted Patent
Utility
US 6,137,890 · App. 08/851,990
Lumped parameter resonator of a piezoelectric speaker
Inventor:
Mitchell A. Markow
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: May 6, 1997
Inventor
Mitchell A. Markow
Assignee (at issue)
Compaq Computer 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.