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 to prove that at the time of the infringement there was in force a contract relating to the patent and containing a condition declared unlawful by this section:

Provided that this sub-section shall not apply if the plaintiff is not a party to the contract and proves to the satisfaction of the court that the restrictive condition was inserted in the contract without his knowledge and consent, express or implied.

(4) Nothing in this section shall -
 * a. affect a condition in a contract by which a person is prohibited from selling goods other than those of a particular person;
 * b. validate a contract which, but for this section, would be invalid;
 * c. affect a condition in a contract for the lease of, or licence to use, a patented article, by which the lessor or licensor reserves to himself or his nominee the right to supply such new parts of the patented article as may be required or to put or keep it in repair.

(5) The provisions of this section shall also apply to contracts made before the commencement of this Act if, and in so far as, any restrictive conditions declared unlawful by this section continue in force after the expiration of one year from such commencement.

141. Determination of certain contracts

(1) Any contract for the sale or lease of a patented article or for licence to manufacture, use or work a patented article or process, or relating to any such sale, lease or licence, whether made before or after the commencement of this Act, may at any time after the patent or all the patents by which the article or process was protected at the time of the making of the contract has or have ceased to be in force, and notwithstanding anything to the contrary in the contract or in any other contract, be determined by the purchaser, lessee, or licensee, as the case may be, of the patent on giving three months notice in writing to the other party.

(2) The provisions of this section shall be without prejudice to any right of determining a contract exercisable apart from this section.

142. Fees

(1) There shall be paid in respect of the grant of patents and applications therefor, and in respect of other matters in relation to the grant of patents under this Act, such fees as may be prescribed by the Central Government.

(2) Where a fee is payable in respect of the doing of an act by the Controller, the Controller shall not do that act until the fee has been paid.

(3) Where a fee is payable in respect of the filing of a document at the patent office, the document shall be deemed not to have been filed at the office until the fee has been paid.

(4) Where a principal patent is granted later than two years from the date of filing of the complete specification, the fees which have become due in the meantime may be paid within a term of three months from the date of the recording of the patent in the register.

143. Restrictions upon publication of specification

Subject to the provisions of Chapter VII, an application for a patent, and any specification filed in pursuance thereof, shall not, except with the consent of the applicant, be published by the Controller or be open to public inspection at any time before the date of advertisement of acceptance of the application in pursuance of section 23.