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 priority date of the claim or to what was published in India or elsewhere in any of the documents referred to in section 13; Provided that in relation to patents granted under the Indian Patents and Designs Act, 1911, this clause shall have effect as if the words "or elsewhere" had been omitted;

f. that the invention so far as claimed in any claim of the complete specification is obvious or does not involve any inventive step, having regard to what was publicly known or publicly used in India or what was published in India or elsewhere before the priority date of the claim:

Provided that in relation to patents granted under the Indian Patents and Designs Act, 1911, this clause shall have effect as if the words "or elsewhere" had been omitted;

g. that the invention, so far as claimed in any claim of the complete specification, is not useful;

h. that the complete specification does not sufficiently and fairly describe the invention and the method by which it is to be performed, that is to say, that the description of the method or the instructions for the working of the invention as contained in the complete specification are not by themselves sufficient to enable a person in India possessing average skill in, and average knowledge of, the art to which the invention relates, to work the invention, or that it does not disclose the best method of performing it which was known to the applicant for the patent and for which he was entitled to claim protection;

i. that the scope of any claim of the complete specification is not sufficiently and clearly defined or that any claim of the complete specification is not fairly based on the matter disclosed in the specification;

j. that the patent was obtained on a false suggestion or representation;

k. that the subject of any claim of the complete specification is not patentable under this Act;

l. that the invention so far as claimed in any claim of the complete specification was secretly used in India, otherwise than as mentioned in sub-section (3), before the priority date of the claim;

m.that the applicant for the patent has failed to disclose to the Controller the information required by section 8 or has furnished information which in any material particular was false to his knowledge;

n. that the applicant contravened any direction for secrecy passed under section 35(***) or made or caused to be made an application for the grant of a patent outside India in contravention of section 39;

o. that leave to amend the complete specification under section 57 or section 58 was obtained by fraud.

(2) For the purposes of clauses (e) and (f) of sub-section (1)-

a. no account shall be taken of secret use; and

b. where the patent is for a process or for a product as made by a process described or claimed, the importation into India of the product made abroad by that process shall constitute knowledge or use in India of the invention on the date of the importation, except where such importation has been for the purpose of reasonable trial or experiment only.

(3) For the purpose of clause (l) of sub-section (1), no account shall be taken of any use of the invention a. for the purpose of reasonable trial or experiment only; or