Resources Contact Us Home
Tapered tube impedance matching underwater voice communicator with bubble silencer

Image Number 2 for United States Patent #4527657.

An underwater voice communicator in which the preferred embodiment comprises a pair of tapered tubes in communication with a diver's mouth. The tubes are constructed of a material having a sound impedance similar to the sound impedance of water. Sound energy issuing from the mouth of a diver is reflected down the length of the tapered tubes to an area of the tube that concentrates the sound for injection into the surrounding water.

  Recently Added Patents
Process for preparing soybean curd using micronized solution of soybean curd
Nitrogen-doped carbon-supported cobalt-iron oxygen reduction catalyst
Printing apparatus having extendable functionality and method thereof
Device and method incorporating an improved text input mechanism
Proximity sensor arrangement in a mobile device
System and method for redundant array copy removal in a pointer-free language
Pharmaceutical dosage form
  Randomly Featured Patents
Catalytic creosote burner for a wood stove
Middle distillate compositions with improved low temperature properties
Web take-up roll
Rail road car truck with rocking sideframe
Bis-benzimidazole compounds and analogs thereof for inhibiting cell death
Oil production processes and apparatus
Griffithsin, glycosylation-resistant griffithsin, and related conjugates, compositions, nucleic acids, vectors, host cells, methods of production and methods of use
Journal form managing method, transaction processing apparatus, and transaction record journal form
Gas composition sensor
Glaucoma treatment