Abstract
The article attempts to elucidate why incumbent leading standard setters lose their grounds through the knowledge spillovers of architectural knowledge in the surge of standardization. Incumbent leading standard setters (i.e., system manufacturers) are presumed to control innovations and interfirm divisions of labor by managing the architectural knowledge of the whole product system concerned. We conduct the analysis of patent forward citations on essential patents (SEP: Standard Essential Patent), which are declared linked with technology specifications, and proprietary patents in the mobile telecommunication industry. The data shows that by the citations of essential patents from incumbent leading standard setters, semiconductor suppliers attempt to build their proprietary knowledge mainly related to interface between telecommunication systems and mobile phones. Also the analysis result reveals that a major semiconductor supplier, Qualcomm, plays as a hub which accelerates the spillovers of architectur...
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