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Under Section 56(1) of the Patents Act, 1970, the validity of a patent of addition shall not be…

Section 56(1) ends by providing that the validity of a patent of addition "shall not be questioned on the ground that" the improvement should have been patented…

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Under Section 56(1) of the Patents Act, 1970, the validity of a patent of addition shall not be questioned on the ground that:

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Correct answer B

Section 56(1) ends by providing that the validity of a patent of addition "shall not be questioned on the ground that" the improvement should have been patented independently. Prior public knowledge, prior claiming and insufficient description remain grounds of challenge, as for any other patent.

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