Patent 4056890 Issued on November 8, 1977. Estimated Expiration Date: November 8, 1994. 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.
A decoy includes a shell wherein a coil spring which is operable to provide power for playing a phonograph recording of a duck call. Additionally the shell includes a pawl and ratchet arrangement operable to wind and unwind a tether line connected to an anchor.