Granted Patent
Utility
US 6,201,874 · App. 09/207,314
Electrostatic transducer with nonplanar configured diaphragm
Inventors:
James J. Croft, III, Elwood G. Norris
Patented Case
View Patent ↗
Granted: Mar 13, 2001
Filed: Dec 7, 1998
Inventors
James J. Croft, III
Elwood G. Norris
Assignee (at issue)
American Technology 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.