page_title: British Leyland Motor Corp v Armstrong Patents Co
section_title: Background
hierarchical_section_title: British Leyland Motor Corp v Armstrong Patents Co / Background
caption_attribution_description: English: This is a derivative work that I created, based on a public domain work: http://en.wikipedia.org/wiki/File:Morris.marina.arp.750pix.jpg. I dedicate to the public all rights in this, my work. For use with British Leyland Motor Corp. v. Armstrong Patents Co. to illustrate subject matter of article.
context_page_description: British Leyland Motor Corp. v Armstrong Patents Co. is a 1986 decision of the House of Lords concerning the doctrine of non-derogation from grants. This doctrine is comparable to, but somewhat broader than, the doctrine of legal estoppel, assignor estoppel, or estoppel by deed in U.S. law. Under the doctrine of non-derogation from grants, a seller of realty or goods is not permitted to take any action that would lessen the value to the buyer of the thing sold.
context_section_description: The factual context of the Leyland case was that British Leyland (BL), the owner of copyright in drawings of the exhaust pipe of a motor car (the Morris Marina) having sold or authorized the sale of the motor car, sought to use the law against copyright infringement to prevent the aftermarket sale of replacement exhaust pipes to purchasers of those motor cars. British Leyland's cars reproduced the drawings in a three dimensional form. Armstrong copied the exhaust pipes of BL's car and thus indirectly copied the drawings. BL sued Armstrong to enjoin the copying.
caption: Rear view of Leyland Marina showing exhaust pipe
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