The Cross-national Comparative Study of the Maintenance Time of Granted Patents in the Technical Field of Fixed Constructions in Different Countries

摘要

The maintenance information of granted patents in the technical field of fixed constructions in China, Germany, France, and Japan are empirically analyzed, which shows that there are many differences in the maintenance time of the patents granted by them. The mean value maintenance time in the technical field of fixed constructions is shorter than that of other technical fields. In the technical field of fixed constructions, the maintenance time of patents granted by France is longer than that of patents granted by China, Germany and Japan; the maintenance time of patents granted by China is the shortest; the maintenance tendencies of granted patents are greatly various in different periods. As the maintenance time extends, the number of patents falls dramatically in China, but in Germany, the number of the patents falls gradually. Large proportion of patents granted by France and Japan are distributed in long maintenance periods.