If the film technology is regarded as a patent, because the patent right is limited by time, at present, the film is definitely not a patent, because it has entered the public domain for a long time and is the wealth of the whole society.
If you mean a film work, it should not belong to the patent right, but to the copyright (copyright, patent right and trademark right are collectively referred to as intellectual property rights).
According to Article 15 of China's Copyright Law, the copyright of film works and works created in a similar way to film production shall be enjoyed by the producer, but writers such as screenwriters, directors, photographers, lyricists and composers shall enjoy the right of authorship and receive remuneration according to the contract signed with the producer. Authors of works that can be used independently, such as scripts and music, in cinematographic works and works created by methods similar to cinematography, have the right to exercise their copyright alone.