8.7.3.14 Cyclic Inventions

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It is possible for "cyclic inventions" to sometimes occur in concurrent cases, e.g. one specification may describe the preparation of B from A; the other describes the preparation of A from B. Neither specification discloses any other means of preparation of either A or B, both of which are presumed to be new compounds or new classes of compounds, since otherwise one of the inventions may not be novel.

As a general rule, it is not permissible to use one specification to assist in the interpretation of the other, even if filed by the same applicant (Pfizer Inc v Commissioner of Patents [2005] FCA 137). The fact that one specification contradicts the other is not a basis for an objection, as each application stands on its own.  Instead, examiners should raise an objection of lack of full description on both applications and seek clarification of the matter.