Over Iris

Iris werkt sinds 2023 als advocaat bij La Gro in het team Intellectueel Eigendom & Technologie en is onderdeel van de sectorgroep Healthcare & Life Sciences. Iris is gespecialiseerd in octrooirecht en in de Farma & Life Sciences praktijk. Zij heeft zich onder meer beziggehouden met vraagstukken zoals tweede medische indicatie octrooien, het concept van plausibiliteit en kwesties rondom ABC’s. Daarnaast heeft Iris ervaring in het opstellen en onderhandelen van bijvoorbeeld licentieovereenkomsten. Ook heeft zij ervaring opgedaan in de Unified Patent Court (UPC)  gerelateerde vraagstukken en procedures.

Voordat zij begon bij La Gro, heeft Iris gewerkt als jurist in het Radboudumc, waar ze zich heeft verdiept in juridische kwesties rondom pediatrische klinische studies.

Buiten haar juridische carrière is Iris altijd maatschappelijk betrokken geweest. Zij heeft verschillende bestuursfuncties bekleed en was actief als lid van de Raad van Advies van Stichting Maashorst in Uitvoering. Ze was politiek actief in de gemeente Oss (stond op de kieslijst in 2018) en heeft zich ingezet voor de ouderenzorg (Rode Kruis) en voor vluchtelingen uit Syrië.

Iris is een enthousiaste, empathische persoonlijkheid, die graag haar tanden zet in moeilijke vraagstukken. Vanuit haar werk en maatschappelijke betrokkenheid heeft ze geleerd om mensen met verschillende belangen en standpunten bij elkaar te brengen. 


  • Octrooirecht
  • Farma & life Sciences
  • Unified Patent Court (UPC)
  • Intellectueel eigendomsrecht

Achtergrond en nevenactiviteiten

  • Bestuurslid van de Stichting Belangenbehartiging Ruiters & Menners Herperduin/de Maashorst
  • Lid van professionele organisaties en beroepsverenigingen, zoals AIPPI, LESI en VF&R
  • 2022, Radboud Universiteit (Master Ondernemingsrecht, cum laude)
Mr. I. E. H. M. (Iris ) Arts 


Intellectueel eigendom & Technologie

Bel Iris Arts

Artikelen van Iris Arts

Marleen van den Horst
Marleen van den Horst
LGGA Pharma Update - 28 November 2023
On 1 November 2023, the District Court of The Hague handed down a decision in the invalidity proceedings instituted by Sandoz B.V. (“Sandoz’’) against Bayer Intellectual Property GmbH. (“Bayer’’). The Court held the once-daily dosing regimen of rivaroxaban, claimed in EP 1 845 961 B1 (“EP 961”), inventive. The use of rivaroxaban and the anticipated launch of Sandoz’s generic product Rivaroxaban is used as an anticoagulant for the treatment of thromboembolic disorders (TEDs). Bayer markets its rivaroxaban product under the name Xeralto. Bayer was the owner of EP 1 261 606 B1 that protects the active ingredient rivaroxaban. Based on said patent, Bayer was granted SPC no. 300370 that will expire on 1 April 2024. Sandoz is planning to launch a generic product containing rivaroxaban in the Netherlands after expiration of the SPC. Sandoz started invalidity proceedings claiming that EP 961 is invalid due to lack of inventive step. Bayer instituted a counterclaim requesting: 1) an injunction against Sandoz for (likely) future infringement of the NL part of EP 961 and 2) a declaration that any offering or placing on the market of Sandoz’ product (e.g. listing the product in the ‘G-Standaard’), or importing or storing the product for those purposes, is an infringing act. What preceded EP 961 was granted on 22 April 2015. Opposition was filed by fifteen parties. In 2018 the Opposition Division revoked EP 961 for lack of inventive step. In appeal, the Technical Board of Appeal (“TBA’’) maintained the patent as granted. Since then, multiple national suits have been filed to invalidate EP 961 e.g. in Germany, Norway and in the United Kingdom. In its decision of 9 June 2023 the Court of Oslo concluded that the patent was inventive. Difference between the TBA and NL proceedings The main difference is that the TBA found EP 961 inventive based on Kubitza I & II and the Harder Abstract, whereas in the Dutch (and Norwegian) proceedings Sandoz introduced the ‘’Harder Poster’’ as new prior art, which was not introduced in the opposition. The Harder Poster reveals parameters in the pharmaco-dynamics that suggest suitability for a once-daily dosing. After summarising the reasoning of the TBA, the District Court of The Hague discusses the Norwegian decision in the parallel proceedings, where the Harder Poster has been taken into account in assessing inventive step. The District Court’s assessment of inventive step Following the parties, the District Court applies the PSA and takes the Harder Poster as the closest prior art. The difference between the Harder Poster and the claimed invention is that the latter concerns the medical use of rivaroxaban in the claimed dosage regimen. Harder is a phase I study on the pharmacodynamic effects of rivaroxaban on eight healthy subjects, but not a study on what the effects and therapeutic efficacy are in patients. The technical effect of the distinguishing feature is that rivaroxaban in the dosage regimen (once daily for at least five days with a rapid release dosage form) is effective and safe in TED patients. According to the Court the objective technical problem is: “finding an oral dosage regimen of rivaroxaban that is safe and effective against TEDs”. This is almost the same as defined by the TBA, albeit that the Court does not concur with the TBA’s (additional) objective of finding a ‘convenient’ dosage regimen as part of the problem to be solved. To assess inventive step, it must be assessed whether, based on the technical problem, the invention was obvious for the average skilled person on the priority date. According to the Court an inventive step is lacking if the person skilled in the art, based on the relevant state of the art, would have solved the problem as claimed in the patent. As the invention is the result of further research, the invention is not only obvious if the skilled person had carried out that research and the results are clearly predictable, but also if there is an incentive in the state of the art that there is a reasonable expectation of success. This means that the skilled person is able to predict a reasonable successful outcome of the research project within an acceptable time period. The hope to succeed is insufficient. The Court points out that the Harder Poster does not provide a reasonable prediction that rivaroxaban would be safe and effective in patients in a once-daily dose. It does not provide convincing results to support this, as the study was conducted in only eight healthy subjects, lacks data on half-life time, whereas the type of tests used were of an experimental nature. Moreover, the skilled person would not have a reasonable expectation of success, because of numerous negative pointers, like 1) the high (and life-threatening) risk of over- and under-dosing patients in anticoagulant research would make him cautious to extrapolate results in phase I studies to a phase II study, 2) Harder does not provide half-time data, which is an important indicator for determining dosing frequency, 3) the negative research experience with a comparable Xa inhibitor, razaxaban, leading to severe bleeding in patients and 4) some medical-ethics committees rejected Bayer’s proposal to test once daily dosing of rivaroxaban in clinical trials. The District Court also assesses Sandoz’ argument that the skilled person, starting to test two- or three-day doses in a phase II study would, through routine steps, ultimately end up with a once-daily dosing regimen. But the Court rejects this view as Sandoz failed to describe how the skilled person would have overcome the negative pointers and would endeavor to also try a once-daily doses with a reasonable expectation of success. Conclusion Based on its own assessment and with reference to the Norwegian judgment and the TBA decision, the District Court rejects Sandoz’ claim for invalidity and holds EP 961 inventive. Both counterclaims of Bayer are granted.
Marleen van den Horst
Marleen van den Horst
Pharma Update - 23 October 2023
On 3 October 2023, the Provisions Judge of the District Court of The Hague rendered its decision in the PI proceedings between Grünenthal GmbH. et al. (“Grünenthal’’) and Teva B.V. et al. (“Teva’’). The Provisions Judge (“PI Judge”) is of the preliminary opinion that EP 1 457 208 B9 (“EP 208”) makes the technical effect plausible and is inventive. The likelihood of EP 208 being held valid in final relief proceedings is high and therefore a PI against Teva is granted. Making this case particularly interesting is that in parallel final relief proceedings, courts in Germany and the United Kingdom have found EP 208 invalid. The PI Judge (who is also a Judge in the Dutch local division of the UPC) is of the preliminary opinion that the plausibility standard in the Netherlands is different from that in the UK, referring to the recent PI decision of the Court of Appeal in the Apixaban case. Grünenthal is since July 2022 the owner of the Dutch part of EP 208 that is in force in the Netherlands until 14 March 2024. It markets the patented drug, which is a long-acting testosterone drug, under the name ‘Nebido’. What preceded  After Teva received a Dutch marketing authorisation for its generic product called ‘Testosterone Teva’ in December 2022, Grünenthal sent warning letters to Teva in February and April 2023, Teva did not respond until 24 August 2023 when it notified Grünenthal that it planned to enter its generic product in the G-Standaard of October 2023. Grünenthal initiated PI proceedings against Teva before the District Court of The Hague, accusing Teva of infringing EP 208. The interim claim in the PI proceedings  A first, interim hearing was held on 12 September 2023 dealing with the incidental (provisional) claim of Grünenthal, requesting the PI Judge to order Teva to withdraw the listing of its generic product from the October G-standard in order to avoid it being published.  The PI Judge handed down its interim decision on 13 September 2023, ordering Teva to withdraw its product from the October 2023 G-Standaard. According to the PI Judge, Grünenthal has a profound interest in maintaining the status quo as Teva is not yet on the market (nor any other generic) nor listed in the G-Standard, so no price erosion has taken place yet. The fact that Teva chose to ignore the warning letters is explicitly taken into account in the ultimate balance of interest in favour of Grünenthal. The main claims in the PI proceedings  On 26 September, the second oral hearing on the main claims was held. Grünenthal claimed that EP 208 is (about to be) infringed and is seeking a PI prohibiting manufacturing and distributing the generic product and an injunction against unlawful conduct.  The PI Judge rendered its decision on the main claims on 3 October 2023, finding the Dutch part of EP 208 provisionally valid and infringed. According to the PI Judge the Dutch part of EP 208 and the Dutch PI proceedings differ from the German and English final relief proceedings because: i) the claims of Dutch part of EP 208 have been substantially limited by Grünenthal during the Dutch PI proceedings, ii) the statements presented, the expert evidence and substantive debate were not identical and iii) the Dutch plausibility standard in the light of inventive step, after G2/21, differs from the plausibility standard in the UK. In formulating the Dutch plausibility standard, the PI judge refers to the G2/21 decision and to the recent decision of the Court of Appeal in the Apixaban case (section 4.35-4.43). which we have discussed in our Pharma Update of 25 August. The PI judge mentions that the plausibility criterion formulated by the Enlarged Board of Appeal in G2/21 is an abstract criterion. It must be filled in based on the specific circumstances of the case. This leads the PI Judge in section 4.41 to consider: “In applying the G2/21 test when assessing the inventive step of a claim in which the technical effect is not included as a feature, unlike the referral from Teva to the TBA case Agrevo, it is not necessary for the patentee to provide proof, or make it plausible in PI proceedings, that the technical effect works with at least the majority of the claimed compositions.”  The PI Judge observes that the outcome could have been different if Teva had made it plausible that the person skilled in the art, based on the application, could not derive, or has reasons to question that the technical effect would occur over the full breadth of claim 1 as limited in the Dutch part of EP 208.