Under Section 61(1) of the Patents Act, 1970, a person interested may oppose restoration on the ground…

Section 61(1) lets any person interested oppose restoration only on "either or both" of two grounds: "that the failure to pay the renewal fee was not unintentional" or "that there has been undue delay in the making of the application". Validity objections such as lack of novelty belong in revocation proceedings under section 64.