Granted Patent
Utility
US 6,147,932 · App. 09/307,266
Acoustic transducer
Inventor:
Douglas S. Drumheller
Patented Case
View Patent ↗
Granted: Nov 14, 2000
Filed: May 6, 1999
Inventor
Douglas S. Drumheller
Assignee (at issue)
Sandia 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.