Patents Act 1977

44 Avoidance of certain restrictive conditions

(1) Subject to the provisions of this section, any condition or term of a contract for the supply of a patented product or of a licence to work a patented invention, or of a contract relating to any such supply or licence, shall be void in so far it purports—

(a) in the case of a contract for supply, to require the person supplied to acquire from the supplier, or his nominee, or prohibit him from acquiring from any specified person, or from acquiring except from the supplier or his nominee, anything other than the patented product;

(b) in the case of a licence to work a patented invention, to require the licensee to acquire from the licensor or his nominee, or prohibit him from acquiring from any specified person, or from acquiring except from the licensor or his nominee, anything other than the product which is the patented invention or (if it is a process) other than any product obtained directly by means of the process or to which the process has been applied;

(c) in either case, to prohibit the person supplied or licensee from using articles (whether patented products or not) which are not supplied by, or any patented process which does not belong to, the supplier or licensor, or his nominee, or to restrict the right of the person supplied or licensee to use any such articles or process.

(2) Subsection (1) above applies to contracts and licences whether made or granted before or after the appointed day, but not to those made or granted before 1st January 1950.

(3) In proceedings against any person for infringement of a patent it shall be a defence to prove that at the time of the infringement there was in force a contract relating to the patent made by or with the consent of the plaintiff or pursuer or a licence under the patent granted by him or with his consent and containing in either case a condition or term void by virtue of this section.

(4) A condition or term of a contract or licence shall not be void by virtue of this section if—

(a) at the time of the making of the contract or granting of the licence the supplier or licensor was willing to supply the product, or grant a licence to work the invention, as the case may be, to the person supplied or licensee, on reasonable terms specified in the contract or licence and without any such condition or term as is mentioned in subsection (1) above; and

(b) the person supplied or licensee is entitled under the contract or licence to relieve himself of his liability to observe the condition or term on giving to the other party three months' notice in writing and subject to payment to that other party of such compensation (being, in the case of a contract to supply, a lump sum or rent for the residue of the term of the contract and, in the case of a licence, a royalty for the residue of the term of the licence) as may be determined by an arbitrator or arbiter appointed by the Secretary of State.

(5) If in any proceeding it is alleged that any condition or term of a contract or licence is void by virtue of this section it shall he on the supplier or licensor to prove the matters set out in paragraph (a) of subsection (4) above.

(6) A condition or term of a contract or licence shall not be void by virtue of this section by reason only that it prohibits any person from selling goods other than those supplied by a specific person or, in the case of a contract for the hiring of or licence to use a patented product, that it reserves to the bailor (or, in Scotland, hirer) or licensor, or his nominee, the right to supply such new parts of the patented product as may be required to put or keep it in repair.