Selection invention allows patenting of compounds which fall within
disclosure of earlier patent if: (1) compounds not specifically
disclosed in earlier patent, and (2) compounds have unexpected
advantages over those compounds specifically disclosed in earlier
patents.
The three part novelty test:
(1) the claimed range must be narrow
(2) it must be sufficiently distant from preferred known ranges
(3) it must not be an arbitrary chosen part of prior art
See also Bleach Additive v Akzo.
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