Principles, which hitherto have not been admissible for Patents, would be likewise excluded from rewards. There could be also no premiums for new modes of manufacture, such as simpler or cheaper manufacture of materials already known, and in the same manner manufacture of new articles directly going into consumption, because, in the first case, the secret use of the invention would present an equivalent, while in the latter cases the start which the inventor has with regard to manufacturing, as well as disposal, before and over his competitors, in most cases is more than sufficient reward for the merit of having given mankind new means of satisfying human enjoyments and necessities. It was consequently a timely Convention between the States of the Zollverein, which already, under date of 21st September, 1842, acknowledged the principle that the granting of a Patent henceforth could establish no right to prohibit either the import or the sale, nor the use of articles agreeing with those patented, as far as articles of consumption are concerned, and that a right of that nature was only applicable to machinery and tools for manufacturers and artisans.[10] Accordingly, the granting of rewards would have to be restricted to inventors of useful machinery and tools, who do not use them solely in their own interest and keep their construction a secret, but, on the contrary, make them accessible to everybody by multiplication. With such regulations as to Patent-right in force in Germany, it will be observed that here, as in other countries, the great disadvantage arises from this, that by the patenting of an invention its utilisation or trial is prohibited to home industry, while the foreigner is quite at liberty to make use of it and to bring the articles in question to market in the country where the Patent exists.