According to the provisions of the second and third paragraphs of Article 19 of the Patent Law, "China units or individuals may entrust a legally established patent agency to apply for a patent and handle other patent affairs in China.
Patent agencies shall abide by laws and administrative regulations, accept the entrustment of clients, and handle patent applications or other patent affairs; The contents of the client's invention and creation shall be kept confidential, except that the patent application has been published or announced. Specific measures for the administration of patent agencies shall be formulated by the State Council. "Enterprises can directly file patent applications, including PCT applications, or entrust patent agencies to file patent applications (including PCT applications). Where a local intellectual property office handles a patent application, it does not belong to the agency behavior permitted by the patent law.
Agencies can help enterprises apply for patents in various countries, including the United States. If necessary, please write further for consultation.