Case Facts
In this case, Tool Metal Manufacturing Co Ltd (TMMC) and Tungsten Electric Co Ltd (TECO) entered into a licence and a deed, both dated 2 April 1938, under which TMMC granted TECO a non-exclusive licence under British letters patent to import, make, use, and sell hard metal alloys described as "contract material". The licence had commenced on 1 June 1937 and was to continue until 18 September 1947, and thereafter until determined by either party on six months' written notice.
Clause 5 of the deed required TECO to pay "compensation" to TMMC if, in any one month, the aggregate quantity of contract material sold or used by TECO (other than material supplied by TMMC or their licensees) exceeded a named quota. Following the outbreak of war in 1939, TMMC voluntarily agreed to suspend the payment of compensation under clause 5, and no compensation was paid after 31 December 1939. At the time of the suspension, it was contemplated by the parties that a new agreement, possibly one that would not include a compensation provision, would be entered into after the conclusion of the war.
A further complicating factor arose in 1941, when the patents relating to the iron grade of contract material expired. From that point onwards, TECO was free to purchase iron grade material from any manufacturer, though clause 5 would, if operative, still apply in respect of their sale or use of such material.
In July 1945, TECO commenced an action against TMMC claiming damages for fraudulent misrepresentation and breach of contract. On 26 March 1946, TMMC delivered a counterclaim in that action, claiming compensation under clause 5 as from 1 June 1945. That counterclaim failed on the ground that it was premature, the court holding that no notice sufficient to terminate the agreed suspension of compensation obligations had been given prior to the counterclaim itself.
In the present action, TMMC claimed compensation from 1 January 1947 to 26 January 1950, quantified at £84,050, together with an account of compensation from 26 January 1950 to 27 July 1950, being the date on which the licence ultimately terminated. The Court of Appeal had decided against TMMC on several grounds, and the matter came before the House of Lords on appeal. The House of Lords reversed the Court of Appeal's decision.
Held
The House of Lords held in favour of TMMC on all principal issues, making four distinct holdings.
First, although equity required that any resumption of a suspended legal right must be preceded by reasonable notice to the other party, the delivery of the counterclaim on 26 March 1946 itself constituted sufficient notice of TMMC's intention to stand upon their strict legal rights. The nine-month period which elapsed between the delivery of the counterclaim and 1 January 1947 amounted to a reasonable period of notice. Accordingly, TMMC were entitled to claim compensation from 1 January 1947.
Second, clause 5 was not void as being in unreasonable restraint of trade by reason of its continued application after the expiration of the patents relating to the iron grade of contract material. The clause did not constitute an unreasonable protection of TMMC's interests. Moreover, there was no evidence that clause 5 was likely to limit the total supply of the relevant material available for sale or to have any substantial effect on the price payable by the consumer. Clause 5 was therefore not contrary to the public interest.
Third, clause 5 did not impose, or purport to impose, a penalty upon TECO. The compensation obligation was not in the nature of a penalty clause.
Fourth, by a majority (Viscount Simonds dissenting), clause 5 was not rendered void by [s 38(1) Patents and Designs Act 1907](s 38(1) Patents and Designs Act 1907). Although clause 5 offered an inducement to TECO to purchase contract material from TMMC or their licensees even after the expiration of the relevant patents, it did not constitute a condition the effect of which would be to "prohibit or restrict" TECO from using any article supplied by a person other than TMMC, nor did it "require" TECO to acquire from TMMC any article not protected by the patents.
Ratio Decidendi
The principal ratio of this decision concerns the doctrine of promissory estoppel and the conditions under which a party who has voluntarily suspended the exercise of a strict legal right may lawfully resume that right.
The House of Lords affirmed the principle, derived from Hughes v Metropolitan Railway Co [1877], that where one party has by agreement or by conduct led the other to believe that strict legal rights will not be enforced, equity will not permit those rights to be reasserted without the giving of reasonable notice. The same principle had been applied in Central London Property Trust Ltd v High Trees House Ltd [1947]. The requirement of reasonable notice is not merely procedural; it is substantive, ensuring that the party who has relied upon the suspension is given a fair opportunity to adjust their affairs before the original obligations are reimposed.
On the facts, TMMC's delivery of their counterclaim in March 1946 served the function of such notice. The nine months between that notice and 1 January 1947 (from which date compensation was claimed in the present action) was held to be a sufficient and reasonable period. The prior counterclaim, which had sought compensation from 1 June 1945, had failed precisely because it had not been preceded by any such notice; the counterclaim itself was the first act capable of constituting notice, and therefore compensation could only run from a date a reasonable period thereafter.
On the restraint of trade issue, the court held that clause 5 was not void as constituting an unreasonable restraint of trade. The relevant question was not whether the clause could be characterised as a "restraint" in the abstract, but whether it unreasonably protected the appellants' interests or was contrary to the public interest. On the evidence, neither criterion was satisfied. There was no indication that clause 5 would restrict the overall supply of hard metal alloys to the market, nor that it would artificially inflate the prices payable by consumers.
On the penalty issue, clause 5 was upheld as a legitimate commercial provision and not as a penalty clause.
On the Patents Act point, the majority held that clause 5 fell outside the prohibition in s 38(1) Patents and Designs Act 1907 because it operated by way of financial inducement rather than by way of prohibition, restriction, or requirement within the meaning of that section. Viscount Simonds dissented on this point alone, taking the view that clause 5 was rendered void by s 38(1).
Obiter Dicta
In the course of his speech, Viscount Simonds offered an important cautionary observation regarding the scope of promissory estoppel. He stated that he would not wish it to be supposed, particularly in commercial transactions, that mere acts of indulgence are apt to create rights. He expressed a specific reluctance to lend the authority of the House of Lords to the statement of principle to be found in Combe v Combe [1951], which he considered may well have been stated far too broadly.
This remark reflects a concern that has persisted in English contract law: that the doctrine of promissory estoppel should not be extended so as to enable a party to generate new enforceable rights through the mere forbearance of another, nor to convert what is fundamentally a defensive principle into a cause of action in its own right. The observation serves as a judicial reminder that the equitable doctrine is properly understood as a shield rather than a sword, and that commercial parties should not assume that informal acts of indulgence, however repeated, will permanently extinguish legal rights without clear notice and reliance of the kind recognised in Hughes v Metropolitan Railway [1877] and Central London Property v High Trees [1947].