# US 7,610,713 B1 · Decoy fin > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,713 B1 - Document ID: US7610713B1 - Status: Granted - Kind: B1 - Application number: 11/279,085 - Filed: 2006-04-07 - Granted: 2009-11-03 - Earliest claimed: 2005-04-07 - Inventors: Thomas A. Eilers - Web page: https://patentgrep.com/patent/US7610713B1 ## CPC - A01M 31/06: Decoys - A01K 91/065: {Jiggling devices, i.e. devices for moving the lure} - 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 - A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS ## Abstract A decoy fin has a unitary body divided into at least three generally planar sections. These sections combine to form a generally helical surface which, when submerged in fluid moving relative thereto, will generate cyclical oscillatory movement. In one manifestation, the decoy fin is coupled through one tether line to an avian decoy such as a duck or goose decoy, and is coupled through a second tether line to an anchor. Consequently, when the combination anchor, decoy fin, decoy and tether lines are immersed in moving water, such as a stream or river, the decoy fin is operative to move the decoy therewith through an oscillatory pattern. The decoy fin is adaptable to application to a number of different types and sizes of avian decoys, and may also be readily adapted for use with fishing lures or for other decoys. ## Claims ### Claim 1 A decoy fin which produces an oscillatory motion when interacting with fluid moving relative thereto, comprising: a unitary body having first and second couplings, and first, second and third generally planar fluid interaction surfaces, said first and second generally planar fluid interaction surfaces angularly offset from each other by an obtuse angle with respect to a first face of said second generally planar fluid interaction surface and said second and third generally planar fluid interaction surfaces angularly offset from each other by an obtuse angle with respect to said first face of said second generally planar fluid interaction surface; a first interface defining a generally linear boundary between said first and said second generally planar fluid interaction surfaces and having a first termination adjacent an outer edge of said unitary body and a second termination adjacent an outer edge of said unitary body distal thereto; and a second interface defining a generally linear boundary between said second and third generally planar fluid interaction surfaces, said second interface angularly offset from said first interface and having a first termination adjacent an outer edge of said unitary body and a second termination adjacent an outer edge of said unitary body distal thereto and thereby defining a distance along said second generally planar fluid interaction surface between said first interface first termination and said second interface first termination which is smaller than a distance along said second generally planar fluid interaction surface between said first interface second termination and said second interface second termination; an anchor coupled to first coupling; and an avian decoy coupled to second coupling; said first coupling formed in said first generally planar fluid interaction surface and located more nearly adjacent to said first interface second termination than said first interface first termination; said second coupling formed in said third generally planar fluid interaction surface and located more nearly adjacent to said second interface first termination than said second interface second termination. ### Claim 2 (depends on 1) The submersible decoy fin of claim 1, wherein said avian decoy further comprises a duck decoy. ### Claim 3 (depends on 1) The submersible decoy fin of claim 1, wherein said avian decoy further comprises a goose decoy. ### Claim 4 (depends on 1) The submersible decoy fin of claim 1, wherein said fluid further comprises water, and said decoy fin is submersed in said water. ### Claim 5 (depends on 1) The submersible decoy fin of claim 1, wherein said unitary body further comprises reformed sheet stock. ### Claim 6 (depends on 5) The submersible decoy fin of claim 5, wherein said reforming further comprises vacuum thermoforming. ### Claim 7 (depends on 5) The submersible decoy fin of claim 5, wherein said unitary body further comprises a helical geometry which will interact with said fluid to generate a helical flow. ### Claim 8 In combination, an anchor, an avian decoy, a submersible decoy fin, a first flaccid member coupling said anchor to said submersible decoy fin, and a second flaccid member coupling said submersible decoy fin to said decoy, said submersible decoy fin oscillatory upon interaction with moving water and operative to cyclically oscillate said decoy relative to said anchor during said interaction with moving water, said submersible decoy fin comprising: a unitary body having first and second couplings, and first, second and third generally planar fluid interaction sections, said second section having first and second major faces on opposed surfaces of said second section, said first and second generally planar fluid interaction sections angularly offset from each other by an obtuse angle with respect to said first major face of said second generally planar fluid interaction section and said second and third generally planar fluid interaction sections angularly offset from each other by an obtuse angle with respect to said first major face of said second generally planar fluid interaction section, a first interface defining a generally linear boundary between said first and said second generally planar fluid interaction sections and having a first termination adjacent an outer edge of said unitary body and a second termination adjacent an outer edge of said unitary body distal thereto; and a second interface defining a generally linear boundary between said second and third generally planar fluid interaction sections, said second interface angularly offset from said first interface and having a first termination adjacent an outer edge of said unitary body and a second termination adjacent an outer edge of said unitary body distal thereto and thereby defining a distance along said second generally planar fluid interaction section between said first interface first termination and said second interface first termination which is smaller than a distance along said second generally planar fluid interaction section between said first interface second termination and said second interface second termination; said first coupling formed in said first generally planar fluid interaction surface and located more nearly adjacent to said first interface second termination than said first interface first termination; said second coupling formed in said third generally planar fluid interaction surface and located more nearly adjacent to said second interface first termination than said second interface second termination. ### Claim 9 (depends on 8) The combination anchor, avian decoy, submersible decoy fin, and first and second flaccid members of claim 8, wherein said avian decoy further comprises a duck decoy. ### Claim 10 (depends on 8) The combination anchor, avian decoy, submersible decoy fin, and first and second flaccid members of claim 8, wherein said unitary body further comprises a helical geometry which will interact with said fluid to generate a helical flow. ### Claim 11 (depends on 8) The combination anchor, avian decoy, submersible decoy fin, and first and second flaccid members of claim 8, wherein said unitary body further comprises reformed sheet stock. ### Claim 12 (depends on 11) The combination anchor, avian decoy, submersible decoy fin, and first and second flaccid members of claim 11, wherein said reforming further comprises vacuum thermoforming.