Can the number of patentees be increased enough after authorization?

Of course. Patent applicants can even change after authorization, including adding applicants. However, the application for change shall be signed by all the original applicants and inventors, and the 200 yuan change fee shall be paid. Within three years from the date of application for a patent for invention, the patent administration department may, upon the request of the applicant at any time, make a substantive examination of its application; If the applicant fails to request substantive examination within the time limit without justifiable reasons, the application shall be deemed to have been withdrawn. When the patent administration department deems it necessary, it may examine the application for a patent for invention on its own. Article 35 of the Patent Law: Within three years from the date of filing, the patent administration department may, at any time, conduct substantive examination of the application upon the request of the applicant; If the applicant fails to request substantive examination within the time limit without justifiable reasons, the application shall be deemed to have been withdrawn. When the patent administration department deems it necessary, it may examine the application for a patent for invention on its own.