Where an application for a patent has been published but a patent has not been granted,any person may,in writing,represent by way of opposition to the Controller against the grant of patent on the ground- (a) that the applicant for the patent or the person under or through whom he claims,wrongfully obtained the invention or any part thereof from him or from a person under or through whom he claims; (b) that the invention so far as claimed in any claim of the complete specification has been published before the priority date of the claim (i) in any specification filed in pursuance of an application for a patent made in India on or after the 1st day of January,1912; or (ii) in India or elsewhere,in any other document: (c) that the invention so far as claimed in any claim of the complete specification is claimed in a claim of a complete specification published on or after the priority date of the applicant's claim and filed in pursuance of an application for a patent in India,being a claim of which the priority date is earlier than that of the applicant's claim