Evaluation and comparison of domestic and foreign patent portfolios based on F-term on optical lenses of competitors

This paper evaluates domestic and foreign patent portfolios owned by ten top competitors in Japan on the optical lenses of digital cameras. The objective is to establish an efficient and simple tool to provide an enterprise with the ability to investigate its competing position in order to identify its favorable research and development directions and enhance its patent application strategy.

The method is to use three quantitative indicators defined by patent classifications, especially the Japanese patent classification F-term. The indicators represent the technical value of a single invention, between multiple inventions, and all inventions, respectively. Comparison of all aspects of values between Japanese and US patent portfolios are presented on two-dimensional maps.

The evaluations show the performance of competitors and obtain the advisements of patent application strategy for an individual company. The results show that Jaccard index based on F-term is a very good tool for calculating the similarity between patents to obtain innovativeness. All indicators show that the thinking of Japanese competitors in R&D and patent filing strategies have high similarity, and there is currently no breakthrough between all competitors. The multi-viewpoint F-term system has resulted in Japanese companies having a large number of patents in a relatively closed environment.