EPO published patent EP3883398A1 for a conductive aerosol generating composite substrate invented by five researchers from R.J. Reynolds Tobacco Company. The invention relates to aerosol source members for inhalation products, with IPC classifications including A61M11/04 (aerosol generating devices). The patent was published March 25, 2026, and designates 31 European states covering major markets.

Manufacturers developing aerosol delivery or vaping products should conduct freedom-to-operate analyses to ensure their products do not infringe this granted patent. Legal teams should review existing product lines and development pipelines for potential overlap with the claimed composite substrate technology. This is a routine patent publication with no compliance obligations for third parties.