Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Double piston acoustic transducer with selectable directivity










Image Number 2 for United States Patent #4996674.

A direction selective transducer which includes a center mass fixed between two active transducer element stacks and two head masses. The center mass couples the two stacks and allows the ratio of radiation produced by each head mass to be selected as desired by varying the amplitude and phase of drive voltages applied to the stacks. The transducer can also be used as a directional receiver.








 
 
  Recently Added Patents
Steering wheel
Semiconductor integrated circuit
Motion estimation for a video transcoder
Nuclear fission reactor, a vented nuclear fission fuel module, methods therefor and a vented nuclear fission fuel module system
Integrating map-reduce into a distributed relational database
Cryptographic key split combiner
RF amplifier with digital filter for polar transmitter
  Randomly Featured Patents
Exercise device
Expandable width bed
Preparation of .alpha.-hydroxymethal acetals
Optically coupled semiconductor device and method for manufacturing the same
Computer process for modeling flow of patients through hospital units
Apparatus for decoding a channel signal into an information signal and reproducing arrangement provided with the apparatus
Frequency converter and communication device
Water-in-oil emulsions of polymers of quaternary ammonium compounds of the acrylamido type
Process of making a bipolar transistor with a trench-isolated emitter
Image sensor and method for manufacturing the same