Passionate about IP! Since June 2003 the IPKat has covered copyright, patent, trade mark, designs, info-tech and confidentiality issues from a mainly UK and European perspective. Read, post comments and participate!

The team is Eleonora Rosati, Annsley Merelle Ward and Merpel. E-mail the Kats here!

The team is joined by GuestKats Söğüt Atilla, Oliver Fairhurst, Claire Gregg, Georgia Jenkins and Marcel Pemsel.

SpecialKats: Verónica Rodríguez Arguijo (TechieKat), Rose Hughes (PatKat) and Jocelyn Bosse (Book Review Editor).

InternKats: Wissam Bentazar, Simone Lorenzi and Kliment Markov.
Results for added matter
New referral on claim interpretation and relevance of G1/24 to added matter confirmed (G1/26) New referral on claim interpretation and relevance of G1/24 to added matter confirmed (G1/26) Reviewed by Dr Rose Hughes on Thursday, June 04, 2026 Rating: 5
Human definitions versus biological reality (T 630/24) Human definitions versus biological reality (T 630/24) Reviewed by Dr Rose Hughes on Monday, April 27, 2026 Rating: 5
The unforgiving gold standard: Why deleting a feature can add matter at the EPO (T 0422/23) The unforgiving gold standard: Why deleting a feature can add matter at the EPO (T 0422/23) Reviewed by Dr Rose Hughes on Sunday, September 28, 2025 Rating: 5
Pitfalls of cell therapy manufacturing IP - A case study (T 0868/23) Pitfalls of cell therapy manufacturing IP - A case study (T 0868/23) Reviewed by Dr Rose Hughes on Monday, July 07, 2025 Rating: 5
The UPC's approach to added matter and functional claims (Abbott v. Sibio Technology, UPC_CoA_382/2024) The UPC's approach to added matter and functional claims (Abbott v. Sibio Technology, UPC_CoA_382/2024) Reviewed by Dr Rose Hughes on Thursday, March 13, 2025 Rating: 5
Unambiguous disclosure without patent profanity (T 2171/21) Unambiguous disclosure without patent profanity (T 2171/21) Reviewed by Dr Rose Hughes on Wednesday, December 20, 2023 Rating: 5
Defining what the invention is not can be as important as defining what the invention is (T 0273/22, Chimeric antibodies/REGENERON) Defining what the invention is not can be as important as defining what the invention is (T 0273/22, Chimeric antibodies/REGENERON) Reviewed by Dr Rose Hughes on Monday, November 13, 2023 Rating: 5
Adding matter by cherry-picking from separate embodiments: Philip Morris v BAT ([2023] EWHC 2616 (Pat)) Adding matter by cherry-picking from separate embodiments: Philip Morris v BAT ([2023] EWHC 2616 (Pat)) Reviewed by Dr Rose Hughes on Monday, October 30, 2023 Rating: 5
Adding matter by amending the description to exclude embodiments (Ensygnia v Shell [2023] EWHC 1495 (Pat)) Adding matter by amending the description to exclude embodiments (Ensygnia v Shell [2023] EWHC 1495 (Pat)) Reviewed by Dr Rose Hughes on Tuesday, August 08, 2023 Rating: 5
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