# US 9,434,455 B2 · Elasmobranch-repelling magnets and methods of use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,455 B2 - Document ID: US9434455B2 - Status: Granted - Kind: B2 - Application number: 14/803,382 - Filed: 2015-07-20 - Published: 2016-01-21 - Granted: 2016-09-06 - Earliest claimed: 2005-03-10 - Applicants: Eric Matthew Stroud - Inventors: Eric Matthew Stroud - Web page: https://patentgrep.com/patent/US9434455B2 ## CPC - A01K 91/18: Trotlines, longlines; Accessories therefor, e.g. baiting devices, lifters or setting reelers - A01K 75/00: Accessories for fishing nets; Details of fishing nets, e.g. structure - A01K 79/02: by electrocution - A01K 83/00: Fish-hooks - A01K 95/00: Sinkers for angling (for trawling A01K75/06) - A01K 99/00: Methods or apparatus for fishing not provided for in groups A01K69/00 - A01K97/00 - A01M 29/24: using electric or magnetic effects, e.g. electric shocks, magnetic fields or microwaves - B63B 32/40: Twintip boards; Wakeboards; Surfboards; Windsurfing boards; Paddle boards, e.g. SUP boards; Accessories specially adapted therefor - E02B 1/006: {Arresting, diverting or chasing away fish in water-courses or water intake ducts, seas or lakes, e.g. fish barrages, deterrent devices (E02B8/085 takes precedence); Devices for cleaning fish barriers} - H01F 7/0231: {Magnetic circuits with PM for power or force generation} - A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS - A01M: CATCHING, TRAPPING OR SCARING OF ANIMALS (appliances for catching swarms or drone-catching A01K57/00; fishing A01K69/00 - {A01K99/00}; biocides, pest repellants or attractants A01N); APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS - B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06) - E02B: HYDRAULIC ENGINEERING (ship-lifting E02C; dredging E02F) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract Devices and methods are disclosed for repelling elasmobranchs with high-pull-force magnets, including devices and methods for reducing by-catch in commercial fisheries and protecting humans from attacks by elasmobranchs. ## Claims ### Claim 1 A method for repelling an elasmobranch comprising: placing a permanent high-pull-force magnet that generates a magnetic field sufficient to repel an elasmobranch into the environment of the elasmobranch wherein the high-pull-force magnet comprises the following properties: (i) a pull force of greater than about 50 pounds; (ii) a nominal strength of greater than about 5000 gauss alone or in combination with one or more other magnets; (iii) a greater than about 5 gauss of magnetic strength at a distance of about 0.01 m to about 1.0 m; and wherein said permanent high-pull-force magnet is attached to a surfboard. ### Claim 2 (depends on 1) The method of claim 1, wherein the permanent high-pull-force magnet is attached to the magnet through integration of the magnet into the surfboard. ### Claim 3 (depends on 1) The method of claim 1, wherein the attachment of the high-pull force magnet to the surfboard is such that it trails behind the surfboard. ### Claim 4 (depends on 1) The method of claim 1, wherein the high-pull-force magnet is coated to prevent corrosion when the magnet is placed in water. ### Claim 5 (depends on 1) The method of claim 1, wherein the high-pull-force magnet is a neodymium-iron-boride magnet. ### Claim 6 (depends on 5) The method of claim 5, wherein the neodymium-iron-boride magnet is coated with nickel. ### Claim 7 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has a shape of a cylinder, a cone, a circle, a cube, a disk, a bar, a sphere, a plate, a rod, a ring, a tube, a stick, a block, or a tapered cone. ### Claim 8 (depends on 1) The method of claim 1, wherein the high-pull-force magnet comprises a hollow portion. ### Claim 9 (depends on 1) The method of claim 1, wherein a plurality of high-pull-force magnets are arranged together in a ring. ### Claim 10 (depends on 1) The method of claim 1, wherein the high-pull-force magnet is capable of spinning. ### Claim 11 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has a pull force of greater than about 100 pounds. ### Claim 12 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has a pull force of greater than about 200 pounds. ### Claim 13 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has a nominal strength of greater than about 10,000 gauss alone or in combination with one or more other magnets. ### Claim 14 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has a nominal strength of greater than about 20,000 gauss alone or in combination with one or more other magnets. ### Claim 15 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has up to about 14,000 gauss of magnetic strength at a distance of about 0.01 m to about 0.5 m. ### Claim 16 (depends on 1) The method of claim 1, wherein the high-pull-force magnet has up to about 320 gauss of magnetic strength at a distance of about 0.1 m to about 0.4 m. ### Claim 17 (depends on 1) The method of claim 1, wherein the high pull force magnet is placed in close proximity to an elasmobranch.