File Name: link_WIPOapp_forpri_CNpub_forpri

Observations: 399,066

 

 

Description: This file determines links between file WIPOapp_for_priority  and file CNpub_for_priority.  That is, we take the foreign priority claims in the WIPO applications, which list a claim date, a claim country, and a patent application number, and we take the foreign priority claims in the Chinese published patents, which also lists a date, country, and an application number. 

                         We merge the two files on these three variables, after doing some light cleaning of the text field for application number in both data sets.  We just keep track of the match of a app_numfix and pub_no, by country. There maybe multiple cases of overlap, but we don’t keep track of this.

 

                         The table at the bottom of this file shows that Chinese patents claiming foreign priority have a foreign priority claim match in WIPO at a rate of about 40 or 50 percent, for the years 2005-2010 that we use in our analysis.  Many firms do not use the WIPO application process and that is the main reason why the match rate is lower for matching CNpub_for_priority records to WIPOapp_for_priority, compared to matching CNpub_for_priority records to USapp_for_priority (which is about 80 percent or the 2005-2010 time period).

 

Variables

 

Variable

Type

Len

Columns in Ascii File

Description

app_numfix

Char

12

1-12

link variable to Chinese patent (unique index of CNpub_basedat)

for_pri_rec_trun2

Char

40

13-52

truncated record of foreign priority claim in Chinese patent data used for matcing 

Pub_No

Char

20

53-72

link variable to WIPO application (unique index of WIPOapp_basedat)

country2

Char

2

73-74

Country code of foreign priority claim 

for_priority_date

Char

10

75-84

date of foreign priority claim 

 

Table Showing Distribution of Matches by Year of Chinese Patent Publications

We start with the 1,080,629 foreign priority claims in CNpub_for_priority. We next select the 851,881 unique values of app_numfix.  For each app_numfix, we ask if the given app_numfix has at least one match in WIPOapp_for_priority and table below reports the results by year of Chinese published application.

 

 

 

Counts

Percent

Not Matched

Matched

Not Matched

Matched

All

541,452

312,429

63.41

36.59

pub_year

127,737

299

99.77

0.23

1999 and earlier

2000

19,547

4,565

81.07

18.93

2001

16,332

13,873

54.07

45.93

2002

18,040

14,383

55.64

44.36

2003

25,799

15,218

62.90

37.10

2004

33,445

18,101

64.88

35.12

2005

50,468

32,685

60.69

39.31

2006

53,032

33,038

61.61

38.39

2007

55,649

41,507

57.28

42.72

2008

51,052

38,999

56.69

43.31

2009

51,196

51,007

50.09

49.91

2010

39,155

48,754

44.54

55.46