Granted Patent
Utility
US 6,310,428 · App. 09/449,412
Piezoelectric switch with audible feedback
Inventors:
Hannu Pulli, Frank Domzalski
Patented Case
View Patent ↗
Granted: Oct 30, 2001
Filed: Nov 26, 1999
Inventors
Hannu Pulli
Frank Domzalski
Assignee (at issue)
ITT MANUFACTURING ENTERPRISES LLC
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.