EconPapers    
Economics at your fingertips  
 

The structure and the evolution of essential patents for standards: Lessons from three IT standards

Sadao Nagaoka, Tomoyuki Shimbo and Naotoshi Tsukada

No 06-08, IIR Working Paper from Institute of Innovation Research, Hitotsubashi University

Abstract: This paper examines the structure and the evolution of the patents declared as essential for three major technical standards in information technology (MPEG2, DVD and W-CDMA). These standards have many essential patents, which are owned by many firms with different interests. Many patents have been applied even after the standard was set. We analyze three important reasons for why the essential patents are many and increase over time: they cover a number of different technology fields, there exist R&D competition even in a narrowly defined technology field and a firm can expand its patent portfolio by using continuations and other practices based on the priority dates of its earlier filed patent applications in the USA. Around 40% of the essential US patents for MPEG2 and DVD standards have been obtained by using these applications. However, our empirical analysis suggests that a firm with pioneering patents does not obtain more essential patents, using these practices.

Keywords: standard; essential patent; continuations (search for similar items in EconPapers)
JEL-codes: O31 O34 (search for similar items in EconPapers)
Date: 2006-09
References: Add references at CitEc
Citations: View citations in EconPapers (6) Track citations by RSS feed

Downloads: (external link)
http://hermes-ir.lib.hit-u.ac.jp/rs/bitstream/10086/15973/1/070iirWP06-08.pdf

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:hit:iirwps:06-08

Access Statistics for this paper

More papers in IIR Working Paper from Institute of Innovation Research, Hitotsubashi University Contact information at EDIRC.
Bibliographic data for series maintained by Digital Resources Section, Hitotsubashi University Library ().

 
Page updated 2019-12-19
Handle: RePEc:hit:iirwps:06-08