The difficulty of national invention patent

Legal analysis: An application for a patent for an invention or utility model should be limited to one invention or utility model. Two or more inventions or utility models belonging to a general inventive concept may be filed as one application. An application for a patent for a design shall be limited to a design used by a product. Two or more designs of products sold or used in the same category in sets may be filed as one application. The applicant may withdraw his patent application at any time before being granted the patent right. The applicant may modify his patent application documents, but the modification of the application documents for patents for inventions and utility models shall not exceed the scope recorded in the original specifications and claims, and the modification of the application documents for patents for designs shall not exceed the scope shown in the original pictures or photographs.

Legal basis: Copyright Law of People's Republic of China (PRC).

Article 20 The term of protection of an author's right of authorship, right of revision and right to protect the integrity of a work is unlimited.

Article 21 The protection period of citizens' right of publication and the rights stipulated in Item (5) to Item (17) of Paragraph 1 of Article 10 of this Law shall be the author's life and fifty years after his death, and shall end on 65438+February 3 1 day in the fiftieth year after his death; If it is a cooperative work, the deadline is 65438+February 3 1 50 years after the death of the last dead author.

The term of protection for the works of legal persons or other organizations, as well as the post works enjoyed by legal persons or other organizations, and the rights specified in Item (5) to Item (17) of Paragraph 1 of Article 10 of this Law is fifty years, ending at 65438+February 3 1 day in the fiftieth year after the first publication of the works, but the works have not been published within fifty years after the completion of the creation.

For cinematographic works and works created by similar cinematographic or photographic methods, the term of protection of the right of publication and the rights stipulated in Items (5) to (17) of Paragraph 1 of Article 10 of this Law is fifty years, ending at 65438+February 3 1 day in the fiftieth year after the first publication of the works. However, if the work is not published within 50 years after the creation is completed, this law will no longer protect it.