Intellectual Property Due Diligence Checklist Guide | LegalDocuments.co.uk

Overview

Intellectual property due diligence is the structured investigation carried out into a target company's IP assets before a commercial transaction completes. It typically happens in the context of a share or asset purchase, a merger, a funding round, or a significant licensing arrangement, anywhere the buyer or investor is relying on the target's intangible assets having real, defensible value.

The purpose is twofold. First, to confirm that the IP exists, is owned by the right entity, and is actually enforceable. Second, to flag any risks that might reduce the value of the deal or create liabilities down the line, such as infringement claims, expired registrations, ownership gaps, or restrictive licence terms.

In the UK, IP due diligence usually covers patents, trade marks, registered and unregistered designs, copyright, database rights, confidential information and trade secrets, domain names, and any licences in or out. The output is normally a report or schedule of findings that feeds into the warranties, disclosures and pricing in the transaction documents. Done well, it shapes how the deal is structured; done poorly, it becomes a source of post-completion disputes.

Key steps

1. Map the patent portfolio. Start by pulling together a complete schedule of every granted patent, pending application, divisional and continuation the target holds or has applied for. Cross-check what the company says it owns against the registers at the UK Intellectual Property Office, the European Patent Office and equivalent bodies in any other relevant territories. Note renewal dates, expiry dates, and whether any fees are outstanding.
2. Test scope, validity and enforceability. A patent is only as useful as the claims it actually grants and the prior art it can withstand. Work through the claims with someone technically qualified, consider whether the invention genuinely meets the tests of novelty and inventive step, and look for anything in the prosecution history that might narrow what can be enforced in practice. Validity challenges are common in litigation, so it pays to stress-test this early.
3. Check geographical coverage against the business plan. Patents are territorial. If the target sells into the US, Germany and Japan but only holds UK protection, that's a commercial gap worth understanding. Build a matrix of protected jurisdictions against actual and planned markets, and flag any territory where the company trades but has no registered rights to rely on.
4. Investigate infringement exposure in both directions. Look at whether the target's products or processes might infringe third-party rights, and separately whether anyone appears to be infringing the target's patents. Freedom-to-operate opinions, cease-and-desist correspondence, and any pending or threatened proceedings all belong in this part of the review. Unresolved infringement risk can materially affect deal value.
5. Assess litigation risk and historic disputes. Ask for a full history of IP-related disputes, whether settled, ongoing or threatened. Patent litigation in the UK and abroad can run into significant costs and management time, and even settled matters may leave behind licensing obligations or undertakings that bind the company going forward. Factor this into warranties and indemnities in the transaction documents.

Common questions