A patent is a two edge sword for companies. While it protects some rights it also can reveal information that a company does not want to see published. A formula cannot be patented and therefore companies maintain them as trade secrets. To this end they resort to all sorts of tricks such as the use of obscure chemical names, omitting important ingredients; to the outright use of deliberate errors. So the referenced formula may not be accurate nor may it be the optimum combination of ingredients. Its purpose is only to demonstrate a particular claim in the patent. Care must be used is assigning a particular formula to a specific commercial product. In addition a company may make unannounced changes to a product once it reaches the market.