Infraacoustic/electric fish fence
Patent 5448968 Issued on September 12, 1995. Estimated Expiration Date: 
February 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 948355 1515547 2146105 2485660 2709984 2745205 2836735 3180047 3363356 Acoustic fish behavioral control device InventorApplicationNo. 167991 filed on 02/23/1994US Classes:119/220Electric typeExaminersPrimary: Swiatek, Robert P.Attorney, Agent or FirmForeign Patent References
International ClassA01K 061/00Foreign Application Priority Data1991-06-27 NOAbstractAn immaterial fish fence is based on a combination of low frequency mechanical vibrations and synchronously modulated electric fields, where fish approaching the fence will be given at the same time fear reactions and directional information by mechanical vibrations, and in addition will feel pain due to the electric field. The fish will then turn and swim away. The fence is implemented by means of columns positioned side by side, each comprising a number of low frequency transducers suspended above each other, each column being suspended in a float. Each column also has two electrical conductors to which a high voltage can be delivered. Thus, synchronized fields of both acoustic and electric type can be generated between and around the columns. | |
