The characteristics of the patent index are heterogeneous although the patent pool is essential for high-tech product developments. The objective of this paper is to explore the reliability of existed patent indicators. The empirical study examines the major firm's patent indicators for DVD technology. Patent data is thus divided into patent-pool group and non patent-pool group. The results show that forward citations, backward citation, patent family, scientific literature, maintenance, transfer of assignee are significant indicators; technological lifecycle, number of assignees, and number of claims are not significant indicators. The contribution of this paper is to find the heterogeneity of technology strategies in the same pool.
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