Answer: D
Article 6, Paragraph 1 of the "Patent Law" stipulates: Inventions and creations completed in the performance of the tasks of the unit or mainly by utilizing the material and technical conditions of the unit are Service inventions and creations. The right to apply for a patent for a service invention-creation belongs to the unit; after the application is approved, the unit becomes the patentee. "So item A is correct. Paragraph 3 of Article 6 of the "Patent Law" stipulates: "For inventions and creations completed using the material and technical conditions of the unit, the unit has a contract with the inventor or designer, and the right to apply for a patent and the patent If there is an agreement on the ownership of rights, the agreement shall prevail. "So item B is correct. Paragraph 1 of Article 9 of the Patent Law stipulates: "Only one patent right can be granted for the same invention and creation. However, if the same applicant applies for both a utility model patent and an invention patent for the same invention and creation on the same day, and the utility model patent right obtained first has not yet expired, and the applicant declares that he has given up the utility model patent right, the invention patent right may be granted. "So option C is correct and option D is wrong.