Resources Contact Us Home

Image Number 8 for United States Patent #7663974.

A fishfinder is provided for identifying with high precision a single fish under the ship and for measuring the length of the fish precisely. An operator of the fishfinder is assisted to grasp the depth and the length of the fish. A fishfinder transmits an ultrasound pulse having a high carrier frequency and an ultrasound pulse having a low carrier frequency by means of a pulse transmission and reception device at predetermined time intervals. A single fish echo is determined and tracked for a plurality of transmission intervals of ultrasound pulses emitted into the water. A target strength of single fish is measured based on the signal strength of a low carrier frequency echo signal from the single fish. The length of the fish is measured based on the target strength. A fish mark is displayed on the screen of an indicator, with the size of the fish mark depending on the fish length.

  Recently Added Patents
Endotracheal tube
Method of fabricating CIGS by selenization at high temperature
Nitrogen and hindered phenol containing dual functional macromolecular antioxidants: synthesis, performances and applications
Anti-FGFR3 antibodies and methods using same
Oil extractor and the preparation method thereof
Traffic flow analysis mitigation using a cover signal
Method for inhibiting thermal run-away
  Randomly Featured Patents
Efficient electronic money
Laser diode for producing an optical beam at a visible wavelength
System, method and program for setting wage for call center personnel
Methods and apparatus of source control for sequential firing of staggered air gun arrays in borehole seismic
Three cylinder engine
Thermo-mechanical analyzer
Method of processing roll
Gloves with utility attachments
Ophthalmologic device for accurately positioning a contact lens to an eye
Method and structure for ultra-thin film SOI isolation