508. Small results.

Where a change has been made in a known article or process to effect a small result of trifling or dubious utility, or where it is not essential to the result obtained, the new variation thereby effected does not in general amount to an inventive step1. These so-called inventions generally consist in the choice of well-known variants to meet some special purpose often at the sacrifice of other advantages in the forms already in use, in circumstances which lend no weight to the argument that the novelty of the new variation implies that it was not obvious