Kappa Opioid Receptor Agonist KTAC Compounds Patent Application EP4157308A2
Summary
The European Patent Office published patent application EP4157308A2 for Kappa Opioid Receptor Agonist-Therapeutic Antigen Binding Protein Conjugate (KTAC) compounds on April 15, 2026. The application, filed by Cara Therapeutics, Inc. with inventors Chalmers and Lewis, covers pharmaceutical compositions related to A61K and C07K classifications. Designated states include all EPO member states across the European Patent Convention region.
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GovPing monitors EPO Patent Bulletin - Peptides (C07K) for new healthcare & life sciences regulatory changes. Every update since tracking began is archived, classified, and available as free RSS or email alerts — 58 changes logged to date.
What changed
The EPO published patent application EP4157308A2 covering Kappa Opioid Receptor Agonist-Therapeutic Antigen Binding Protein Conjugate (KTAC) compounds on April 15, 2026. The application is classified under multiple IPC codes including A61K 47/68, A61K 38/07, A61K 39/395, C07K 5/107, C07K 16/24, and A61K 31/50, indicating a range of pharmaceutical formulations and therapeutic applications.
Affected parties include pharmaceutical companies engaged in opioid receptor research and therapeutic protein development. Competitors in the kappa opioid receptor agonist space should review the application claims to assess potential freedom-to-operate implications for their own drug development programs.
Archived snapshot
Apr 25, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
KAPPA OPIOID RECEPTOR AGONIST-THERAPEUTIC ANTIGEN BINDING PROTEIN CONJUGATE (KTAC) COMPOUNDS
Publication EP4157308A2 Kind: A2 Apr 15, 2026
Applicants
Cara Therapeutics, Inc.
Inventors
CHALMERS, Derek, T., LEWIS, Michael, E.
IPC Classifications
A61K 47/68 20170101AFI20250425BHEP A61K 38/07 20060101ALI20250425BHEP A61K 39/395 20060101ALI20250425BHEP C07K 5/107 20060101ALI20250425BHEP C07K 16/24 20060101ALI20250425BHEP A61K 31/50 20060101ALI20250425BHEP
Designated States
AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR
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