a) Principles b) Sufficient substantiation of grounds for opposition c) Insufficient substantiation of grounds for opposition d) Alleged public prior use e) Non-patent literature or oral disclosure Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_iv_c_2_2_8.htmDate retrieved: 17 May 20219 references found. Click X to load a reference inside the current page, click on the title to open in a new page.Case Law Book: III AmendmentsXCLR III G 1 IntroductionLoading...XCLR III G 2.1 Non-exhaustive list of admissible means of evidenceLoading...Case Law Book: IV Divisional ApplicationsXCLR IV C Opposition procedureLoading...XCLR IV C 2.2 Formal requirements for opposition and filing in due timeLoading...XCLR IV C 2.2.8.A PrinciplesLoading...XCLR IV C 2.2.8.B Sufficient substantiation of grounds for oppositionLoading...XCLR IV C 2.2.8.C Insufficient substantiation of grounds for oppositionLoading...XCLR IV C 2.2.8.D Alleged public prior useLoading...XCLR IV C 2.2.8.E Non-patent literature or oral disclosureLoading...