The transfer of patent ownership of utility model shall be submitted to the empowered authority for: 1° record in the register of patents of utility model; 2°publication of details of the change in patent ownership of utility model. Recording of transfer of patent ownership of utility model shall be subject to payment of the prescribed fee. Any change in patent ownership of utility model shall have effect in relation to third parties only after recording into the register of patents of utility model. Where two or more persons own the same patent of utility model, each of them may assign or transfer separately, by means of succession, his share in the patent of utility model. The empowered authority may refuse to record a contract for the transfer of ownership of utility model (assignment) when it decides that the contract concerning the right in question contains one or more clauses that are abusive or anti-competitive or in any manner restrain trade or are likely to have any of those effects. The empowered authority shall hear the allegations of the parties to the contract, if one or both so request, and shall take into account evidence that is pertinent provided by parties to the contract. Any decision of the empowered authority to refuse to record the contract may be subject to appeal to the appeal committee provided by this Law within a period of thirty (30) days from the date on which the owner was notified the decision. Where the appellant is not satisfied by the appeal committee’s decision, he may appeal to the competent tribunal within a period of thirty (30) days from the date on which he was notified the appeal committee’s decision. For the purposes of the provisions of this article, any limitations imposed on the assignee that do not derive from the rights conferred by the registration of the right, and that are not necessary for the safeguard of that right shall be deemed abusive or, in the event that they have anti-competitive effects, anti-competitive. The patent of utility model assignment contract will cease immediately to produce effects after invalidation of the patent of utility model by tribunals. Article 85: Patent contractual license The owner of a patent of utility model may, by contractual arrangement, grant a license to use his invention of utility model to another natural or legal person. The license contract shall be drawn up in writing and shall be signed by the parties to the contract. The license contract shall be submitted to the empowered authority which shall keep the content secret. The empowered authority records in the register of patents of utility model, subject to the payment of the prescribed fee for the publication of the license contract. Any license contract of utility model shall be valid once recorded in the register of patents of utility model.