Patents Act, 1970
128. Subscription and verification of certain documents by patent agents
(1) Subject to the provisions contained in sub-section (2) and to any rules made under this Act all applications and communications to the Controller under his Act may be signed by a patent agent authorized in writing in this behalf by the person concerned.
(2) The following documents namely,-
(i) applications for patents;
(ii) applications for the restoration of lapsed patents;
(iii) applications for the sealing of patents after the time allowed for that purpose by or under sub-section (2), or sub-section (3) of section 43 has expired;
(iv) applications for leave to amend;
(v) applications for compulsory licenses or for revocation; and
(vi) notices of surrender of patents, shall be signed and verified in the manner prescribed by the person making such applications or giving such notices:
PROVIDED that if such person is absent from India, they may be signed and verified on his behalf by a patent agent authorized by him in writing in that behalf.