This survey includes all national law statutes (known to the author), conveying broader rights when compared with Article 55 of the European Patent Convention. The statutes provided in this survey have primarily been retrieved from the World Intellectual Property Organization (WIPO) and from national patent offices where appropriate. Links to the materials used are provided after each statute.
Briefly, the survey documents that 72 countries offer broader rights to applicants, when compared with EPC Article 55. Of those countries, 46 include the right to claim priority under the Paris Convention. In all, 61 contracting states to the Patent Cooperation Treaty have national law with a broader grace period when compared to EPC Article 55.
Struve, Frederik, "Novelty Grace Periods: A National Law Survey" (2013). Student Scholarship. Paper 3.