QMC Instruments Limited v Celtic Terahertz Technology Limited & Ors

Decision date: 26 November 2025

Neutral citation: [2025] EWHC 3485 (IPEC)

Overall AI summary confidence: high

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Short overview

This short overview is intended to summarise the case, issues and outcome so far as they are supported by the judgment.

AI confidence in this short overview: high

QMC Instruments Ltd sued Celtic Terahertz Technology Ltd and others over ownership and licence rights in multi‑mesh filters (MMFs) arising from a 1991 acquisition/licence and a 2001 collaboration/licence. The court refused QMCIL's summary judgment application, finding both parties' constructions of the 1991 term arguable, clause 2(c) of the 2001 agreement reads prospectively (referring to rights "acquired or developed") and does not clearly create an automatic extant exclusive licence, and there was insufficient basis to recognise the wide equitable duties QMCIL alleged. The case was stayed for mediation; interim costs payments were ordered.

Ratio decidendi

This summary is intended to identify the ratio decidendi, meaning the legal reasons for deciding and the binding part of the decision.

AI confidence in this ratio decidendi summary: high

The judge held that where contractual language is ambiguous and lacks definitions, proper construction can require factual inquiry and summary judgment is inappropriate; prospective wording such as "acquired or developed" and contextual markers support construing a licence provision as prospective rather than an automatic present exclusive licence over existing IP.

Obiter dicta

This summary is intended to identify obiter dicta, meaning observations made by the way that were not necessary to deciding the case and are not binding.

AI confidence in this obiter dicta summary: medium

The judgment noted (obiter) that long‑term collaboration alone does not necessarily make a commercial contract relational so as to import fiduciary‑type obligations, and that unparticularised claims to copyright or confidential information are problematic without identification of specific material relied upon.

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