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Slingsby Partners LLP

Philip Slingsby

Philip Slingsby has been in the intellectual property profession since the early 1990s.  He is a Chartered Patent Attorney, a European Patent Attorney, a Registered Trademark Attorney and an European Trademark Attorney.

Philip specialises in advising clients on strategic patent issues, including patent portfolio development, patent licensing and litigation.

In the field of patent acquisition, Philip’s work involves helping clients develop policies to capture and protect the results of large-scale development programs, advising on patentability of software and firmware inventions, and drafting patent applications in complex technical areas.  He has worked with clients to manage portfolios ranging from a handful of patents up to some of the world’s largest.

Philip has 20 years’ experience in advising European-based clients on defending and resolving patent litigation actions, particularly in the US.  He has been responsible for establishing invalidity of numerous patents involved in actual or threatened litigation, managing invalidation actions such as reexaminations, oppositions and post-grant reviews, advising on the handling of International Trade Commission investigations, and negotiating favourable licensing settlements.  He has successfully represented clients in over 50 opposition and appeal hearings at the European Patent Office.

During a period working in house at one of the world’s largest telecoms companies, he worked on negotiating global cross-licensing deals and standards-based licensing structures for essential patents.

Philip’s technical specialisations include electronics, automotive, software, telecoms and materials.


Legal 500:

2018: "Managing partner Philip Slingsby heads the team and advised Cambridge Medical Robotics on the patent portfolio behind its new surgical robot."

2017: "Founding partner Philip Slingsby has a wealth of knowledge and experience in both patent procurement, licensing and litigation."

2016: "Founding partner Philip Slingsby leads a group with knowledge of the hi-tech end of the spectrum ..."

2015: "Philip Slingsby ... [is] highly recommended."

2014: "Philip Slingsby ... [is] ‘highly knowledgeable’ and ‘imbued with business acumen’."

IAM Patent 1000:

2018: "Philip Slingsby at Slingsby Partners drafts applications that are always of great practical and commercial use to clients."

2017: "Founder Philip Slingsby is 'highly respected by everyone he works with'; clients have 'complete trust in his unparalleled level of technical intellect and commercial understanding'."

2016: "The Chancery Lane-based IP outfit maintains a prodigious workload and a loyal following - in no small part thanks to the fame of name partner Philip Slingsby.  'His approach is always through, but also creative and commerical, particularly when it comes to the defensive strategies being deployed by his clients.'  Active in the profession since the early 1990s, he has now successfully represented clients in over 50 opposition and appeal hearings before the EPO."

2015: "The small size of the team belies the number of different technical areas that it can adroitly cover.  Philip Slingsby sets the tone: 'With his experience and knowledge, he is a true asset to have on your side. He’s very quick to understand difficult technical issues, and moreover, his advice is resolutely commercial.'"

2014: "The compact team is blessed with a number of skilled attorneys, but first among them is Philip Slingsby.  'Philip's experience and knowledge of his client's technology and operating environment is remarkable.  He is world class and you can't help but recommend him to others.'"

IP Stars:

2018: "Slingsby is commended by a number of clients. 'Philip is exceptionally bright and capable of understanding the technical intricacies of the projects our company works on,' says one.

Philip Slingsby


Philip Slingsby
Managing Partner

Qualified 1993
Partner 1999

European Patent Attorney
Chartered Patent Attorney
European Trademark Attorney
Registered Trademark Attorney
European Design Attorney

MA (Cantab), Natural Sciences



The Legal 500 - The Clients Guide to Law Firms