In my opinion, even if a product specifying an employee invention is produced and sold in patent-unregistered countries, it is reasonable to include sales in the countries in calculating the employer's sales. The reason is that according to Article 15(1) of the Invention Promotion Act, an employee has the right to claim remuneration for an employee invention because he inherited his completed employee inventions to an employer, and he does not have the right to claim remuneration for an employee invention because the employer have received patent registration for the employee inventions. Furthermore, according to Article 16 of the Act, even if a employer inherits the right to employee inventions from an employee and fails to apply for a patent to register the employee inventions as a patent, the employee invention remuneration must be paid. Based on the two Articles, the registration of a patent right for an employee invention cannot be a prerequisite for the occurrence of the right to claim for an employee invention. Where a product specifying an employee invention is produced and sold in patent-unregistered countries, the method of including sales in the countries in calculating the employer's sales can contribute to Korea's industrial development because employee's incentive to create an employee invention can be strengthened by allowing the employee invention remuneration to be calculated higher than the present.