patent citation analysis of e-paper industry

THE EMERGING FIRMS IN THE EMERGING FIELD: PATENT CITATION ANALYSIS OF E-PAPER INDUSTRY

Patent Citation Analysis of E-Paper Industry

Show-Ling Jang, Yun-Chen Yu, Tzu-Ya Wang

Outline The E-Book Industry E-Paper Technology Literature Methods Results Conclusion

The E-Book Industry First introduced by Sony Kindle’s success Brands: Amazon, Sony, Netronix (振耀 ),

Samsung, Fujitsu, 翰林 , NOOK

The E-Book Industry

Technologies of E-Paper EPD (Electrophoretic Display)Charged particles/powdersAdopted by E Ink, SiPix and Bridgestone

Technologies of E-Paper Ch-LCD Cholesteric liquid Adopted by Kent Display

Literature Cassiman and Veugelers (2006) Hadgedoorn and Duysters (2002) Freeman (1977, 1979)

Data and Methods Sample Period: 1994-2008 USPTO issued patents Emerging Firms: E Ink, SiPix, Kent

Display and Bridgestone Knowledge Diffusers: Copytele, Xerox

and Eastman Kodak

Data and Methods Finding Knowledge Diffusers1. Citing Frequency: (Criterion: >10)2. Finding e-paper-related Patent

(Criterion: 38 UPC Classes) Building up the citation network Calculating Network Indicators

Data and Methods Degree Centrality (Direct Linkages)

Betweenness Centrality (Role as Transmitter)

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Results Emerging Stage (1994)

Results Emerging Stage (1999)

Results Developing Stage (2004)

Results Commercialization Stage (2008)

Results Degree Centrality

0

5

10

15

20

25

30

35

40

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008年

%

Bridgestone Copytel E Ink Eastaman Kodak Kent Displays SiPix Xerox

Results Betweenness Centrality

0

10

20

30

40

50

60

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008年

%

Bridgestone Copytel E Ink Eastman Kodak Kent Displays SiPix Xerox

Conclusions Emerging Firms Knowledge Diffusers ACTIVENESS in learning is essential!