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 :a. the names and addresses of grantees of patents;
 * b. notifications of assignments, extensions, and revocations of patents; and
 * c. particulars of such other matters affecting the validity or proprietorship of patents as may be prescribed.

(2) No notice of any trust, whether express, implied or constructive, shall be entered in the register, and the Controller shall not be affected by any such notice.

(3) Subject to the superintendence and directions of the Central Government, the register shall be kept under the control and management of the Controller.

(4) For the removal of doubts, it is hereby declared that the register of patents existing at the commencement of this Act shall be incorporated in, and form part of, the register under this Act.

68. Assignments, etc, not to be valid unless in writing and registered

An assignment of a patent or of a share in a patent, a mortgage, licence or the creation of any other interest in a patent shall not be valid unless the same were in writing and the agreement between the parties concerned is reduced to the form of a document embodying all the terms and conditions governing their rights and obligations and the application for registration of such document is filed in the prescribed manner with the Controller within six months from the commencement of this Act or the execution of the document, whichever is later or within such further period not exceeding six months in the aggregate as the Controller on application made in the prescribed manner allows:

Provided that the document shall, when registered, have effect from the date of its execution.

69. Registration of assignments, transmissions etc..

(1) Where any person becomes entitled by assignment, transmission or operation of law to a patent or to a share in a patent or becomes entitled as a mortgagee, licensee or otherwise to any other interest in a patent, he shall apply in writing in the prescribed manner to the Controller for the registration of his title or, as the case may be, of notice of his interest in the register.

(2) Without prejudice to the provisions of sub-section (1), an application for the registration of the title of any person becoming entitled by assignment to a patent or a share in a patent or becoming entitled by virtue of a mortgage, licence or other instrument to any other interest in a patent may be made in the prescribed manner by the assignor, mortgagor, licensor or other party to that instrument, as the case may be.

(3) Where an application is made under this section for the registration of the title of any person the Controller shall, upon proof of title to his satisfaction,
 * a. where that person is entitled to a patent or a share in a patent, register him in the register as proprietor or co-proprietor of the patent, and enter in the register particulars of the instrument or event by which he derives title; or
 * b. where that person is entitled to any other interest in the patent, enter in the register notice of his interest, with particulars of the instrument, if any, creating it:

Provided that if there is any dispute between the parties whether the assignment,mortgage, licence, transmission, operation of law or any other such transaction has validly vested in such person a title to the patent or any share or interest therein, the Controller may refuse to take any action under clause (a) or, as the case may be, under clause (b), until the rights of the parties have been determined by a competent court.

(4) There shall be supplied to the Controller in the prescribed manner for being filed in the patent office copies of all agreements, licences and other documents affecting the title to