Trailer kingpin locking device
Patent 7306254 Issued on December 11, 2007. Estimated Expiration Date: 
August 2, 2025. 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.
August 2, 2025. 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 2755655 3386274 3600914 King pin lock Security device for trailer coupling pin Kingpin lock for semi-trailer type travel trailers Locking apparatus for portable devices Trailer kingpin locking device with protected locking bar aperture Kingpin lock Security device for trailer InventorsAssigneeApplicationNo. 11195507 filed on 08/02/2005US Classes:280/507, Protector or lock280/432, Safety devices70/14, PORTABLE70/58For portable articlesExaminersPrimary: Morris, Lesley D.Assistant: Arce-Diaz, Marlon Attorney, Agent or FirmInternational ClassesB60D 1/60E05B 73/00 AbstractA security device is disclosed which mounts to a king pin of a trailer to prevent unauthorized coupling of the trailer to a tractor. The security device includes a austempered ductile iron dual shell body having an inner shell for receiving a trailer kingpin and an outer conical or contoured shell to prevent unauthorized coupling to the trailer kingpin. The security device further includes a stainless steel collar placed between the inner and outer shells for deterring damage.Other References
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