(b) if the patent application is jointly owned, the application may only be withdrawn if such withdrawal is requested by all of the joint owners. A reference to the withdrawn application shall be entered by the entity responsible for industrial property in the National Register of Patents referred to in the first paragraph of Article 58 below. 41. The following patent applications shall all be rejected: (1) those which are not considered inventions as defined by Article 23 above; (2) those which may not be patented for the purposes of Article 24 above; (3) those which are not considered industrially applicable inventions, as defined by Article 25 above; (4) those which have not been corrected within the time period of three months laid down in Article 32 above; (5) those which do not satisfy the provisions of Article 37 above; (6) those which concern several inventions or more than one invention which are not linked to each other as defined by Article 38 above. All rejections of patent applications must be substantiated and notified to the applicant or his agent by registered letter with acknowledgement of receipt. A reference to said rejection shall be entered in the National Register of Patents referred to in the first subparagraph of Article 58 below. 42. For the purposes of National Defense, the grant and working of an invention patent may be prohibited, definitively or temporarily, where publication of the invention is liable to harm the nation’s security. To this end, any patent application, once the patent application has been corrected, within the time period of 15 days provided for in the first paragraph of Article 43 below, may be consulted on a confidential basis on the premises of the entity responsible for industrial property. Before the expiry of the time period of 15 days referred to in the previous paragraph, a decision, either to postpone the grant and disclosure of the patent until the expiry of the time period of 18 months stipulated in the first paragraph of Article 44 below, or to prohibit definitively the grant, disclosure and working of said patent, shall be notified to the competent administrative authority and to the entity responsible for industrial property. If, once the time period of 15 days referred to in the second subparagraph of this Article has expired, no decision has been notified to the competent administrative authority and the entity responsible for industrial property, the report referred to in Article 43 below shall be conveyed or notified to the applicant or his agent. In the event of a postponement, and where no decision to maintain or lift the postponement on the grant of the patent has been notified to the competent administrative authority and to the entity responsible for industrial property during the time period of 18 months referred to in the first subparagraph of Article 44 below, the aforegoing report shall be conveyed or notified and the patent shall be granted to the applicant or his agent on the conditions laid down in Articles 46 to 48 below. Where there is a definitive prohibition on the grant, disclosure and working of the patent, the aforegoing report shall not be drawn up and the patent shall not be granted.