Case: General Tire &amp; Rubber Co v Firestone Tyre and Rubber Co Ltd [1972] RPC 457
Outcome: followed
The reference by Lord Reid to "clearly and unmistakably" no doubt refers to the same source as lay behind the well-known passage from the later Court of Appeal judgment in General Tire &amp; Rubber Co v Firestone Tyre and Rubber Co Ltd [1972] RPC 457 at 485 486: "If the prior inventor's publication contains a clear description of, or clear instructions to do or make , something that would infringe the patentee's claim if carried out after the grant of the patentee's patent, the patentee's claim will have been shown to lack the necessary novelty, that is to say, it will have been anticipated. The prior inventor, however, and the patentee may have approached the same device from different starting points and may for this reason, or it may be for other reasons, have so described their devices that it cannot be immediately discerned from a reading of the language which they have respectively used that they have discovered in truth the same device; but if carrying out the directions contained in the prior inventor's publication will inevitably result in something being made or done which, if the patentee's patent were valid, would constitute an infringement of the patentee's claim, this circumstance demonstrates that the patentee's claim has in fact been anticipated. If, on the other hand, the prior publication contains a direction which is capable of being carried out in a manner which would infringe the patentee's claim, but would be at least as likely to be carried out in a way which would not do so, the patentee's claim will not have been anticipated, although it may fail on the ground of obviousness. To anticipate the patentee's claim the prior publication must contain clear and unmistakeable directions to do what the patentee claims to have invented : Flour Oxidizing Co. Ltd. v. Carr &amp; Co. Ltd. ((1908) 25 R.P.C. 428 at 457, line 34, approved in B.T.H. Co Ltd v Metropolitan Vickers Electrical Co. Ltd. (1928) 45 R.P.C. 1 at 24, line 1). A signpost, however clear, upon the road to the patentee's invention will not suffice. The prior inventor must be clearly shown to have planted his flag at the precise destination before the patentee. [Emphasis added.] 54 The patent in suit in General Tire &amp; Rubber Co [1972] RPC 457 was for a process for making a compound suitable for tyre treads by mixing synthetic rubber with oil and carbon black and for the compound thus made (at 470). The issue in General Tire &amp; Rubber Co [1972] RPC 457 , as appears from the general treatment of anticipation from 486 497, focussed upon the method or process. The references to a signpost and a flag, which have excited later imaginations, deal with a situation in which the language and the directions given as to process or method were equivocal. The main principle is that, if the prior inventor's publication contains a clear description of something that would infringe the patentee's claim if carried out after the grant of the patentee's patent, the patentee's claim will have been shown to lack the necessary novelty. Alternatively, if the prior inventor's publication contains clear instructions to do or make something that would infringe the patentee's claim if carried out after the grant of the patentee's patent, the patentee's claim will have been shown to lack the necessary novelty. 68 After referring to the well-known passage from General Tire &amp; Rubber Co [1972] RPC 457 at 485 486 and citing various other cases, his Honour said ( Alphapharm [2008] FCA 559 at [161] ): "What does "enabling disclosure" mean in the context of a product claim? It means that the earlier disclosure must point unmistakeably to the (+)-enantiomer of citalopram, as distinct from the racemate, as a drug desirable to obtain." I take "as distinct from" to mean "separately from" not "instead of" or "as opposed to". This does not include any separate requirement of enablement in accordance with SmithKline Beecham (Paroxetine Methanesulfonate) Patent [2006] RPC 323 and is consistent with my opinion.