[ REPUBLIC OF ANGOLA Article 21 (Term) 1. The term of the registration of an industrial design shall be five years from the filing date of the application for registration. 2. Registration may be renewed for two further consecutive periods of five years on payment of the prescribed fee. Article 22 (Inalterability of an industrial design) 1. On pain of lapsing, industrial designs must remain unalterable for the term of the deposit. 2. Any alteration to the essential elements of an industrial design shall always entail a new deposit, save where the changes are the result of its expansion or reduction, or changes made to its color or material by its owner. Article 23 (Application for a deposit) 1. The deposit of an industrial design must be applied for in a request containing the following information: a) information identifying the applicant; b) a sample of the object or a graphic representation of the industrial design; c) the novelty and usefulness that are attributed to utility models or, in the case of industrial designs, simply the novelty; d) an indication of the type or types of products for which the industrial design is to be used. 2. One application may refer only to one single deposit. Article 24 (Acceptance of a deposit) Where it is established that an application for a deposit satisfies the requirements laid down in this law, the depositor shall be issued with a certificate of registration.