Independent Thinking Collective Excellence

Who We Are

Ranked in tier 1 by The Legal 500 and Chambers and Partners, we are one of the largest UK and European Patent and Trade Mark Attorney firms, with offices in LondonOxford, Cambridge, Paris and Munich. Established in the 1940s by our founder, John Arthur Kemp, we have grown to become one of a handful of leading UK firms with a strong international practice.

On 1 October 2019 the firm became a Limited Liability Partnership. On this date, J A Kemp’s business, contracts and client monies were all transferred to J A Kemp LLP.

The breadth and depth of our technical knowledge relevant to patents is outstanding, with over 80 science and technology graduates in the firm including over 40 PhDs. No area of science or technology is outside our scope.

Our trade marks team comprises senior professionals with backgrounds in major international law firms. The team has the expertise and resources to handle any trade marks matter.

Our People

What We Do

We draft, file and prosecute patent applications in the UK, Europe and the rest of the world. We handle patent oppositions and appeals within Europe, especially before the European Patent Office. We add value to your business by advising on patent strategy, such as where and when to file applications. We can help you to manage your patent portfolios in individual countries, regionally or worldwide.

We advise on trade mark selection and strategy and we file, defend and oppose trade mark applications in the UK, Europe and the rest of the world. We can obtain global protection for your trade marks through international applications before the World Intellectual Property Organization (WIPO) and by instructing filing and prosecution programmes worldwide.

We handle all aspects of design protection in the UK, Europe and the rest of the world.

We provide intellectual property litigation support services in matters in the High Court of England and Wales, the Intellectual Property Enterprise Court, the UK Intellectual Property Office and the European Union Intellectual Property Office, plus their respective appeal courts. 

Our Specialisms

Why Choose Us?

We set great store by what our clients say about us. These comments are all from leading legal and IP directories or provided directly by our clients.

Managing Intellectual Property

J A Kemp was awarded "Best UK Patent Prosecution Firm" at the Managing Intellectual Property Awards 2020.

Chambers and Partners

 "J A Kemp demonstrates excellent technical prowess matched by legal sophistication. Unlike many other European patent attorneys, I view the partners there as collaborators rather than as service providers."

IAM Patent 1000

"Unified team culture, deep concentration of technical expertise and ability to effortlessly switch to another gear in times of extreme need.”

Managing Intellectual Property

“J A Kemp is second to none in my experience.”

Overseas Attorney Firm

"I don’t work with anyone as good.  I recommend J A Kemp because it’s good for my clients."

J A Kemp Client

"If I want an opinion I’ll go with J A Kemp."

Chambers and Partners

"They identify with our priorities, are immediately responsive and generate confidence in their technical ability."

World Trademark Review 1000

“A very sharp firm, nimble on its feet and able to really deliver, J A Kemp is timely, professional and excellent value for money.”

Managing Intellectual Property

"Clients are most impressed with the work of J A Kemp. The team are highly responsive, intensely hard-working, and uniformly thoughtful in their handling of prosecution and post-prosecution matters (e.g. oppositions). They are proactive and induce a high degree of confidence." 

IAM Patent 1000

"J A Kemp offers some of the finest patent services in Europe, delivers cast-iron protection for inventions of all types and conducts sterling opposition and appeal work at the EPO."

Chambers and Partners

"I am really impressed with them.  The team is very proactive, strategic and thinks about the best way to move forward."

The Legal 500

"J A Kemp’s team of trade mark attorneys are true experts and above all extremely commercial."  

IAM Patent 1000

"The whole team is extremely knowledgeable of the underlying subject matter and also of EU patent practice - they do a valuable analysis of the specifications to optimise the patent’s strength."

J A Kemp Client

"J A Kemp gives good, clear, commercial recommendations."

Overseas Attorney Firm

"J A Kemp is my preferred firm because the level of service and understanding of the client’s technology is great."

World Trademark Review 1000

J A Kemp is "a go-to for UK and European trademark matters – its expert practitioners provide practical advice quickly and for a fair price, and impress at every turn".

J A Kemp Client

"J A Kemp has a very 'can do' attitude for jobs which are complex."

Overseas Attorney Firm

"These are some of the most detailed and thorough instructions that I have ever seen. They evidence a keen understanding of US practice."

IAM Patent 1000

"J A Kemp is extremely knowledgeable and does a fantastic job."

Overseas Attorney Firm

"I cannot thank you enough for your expert advice and careful strategic thinking in this matter."

J A Kemp Client

"We want the best protection available and I give J A Kemp the highest marks possible."

Work At J A Kemp

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