File Name: link_USapp_appnum_CNpub_forpri
Observations:
286,158
(Note links
obtained for Chinese patents published 2005-2010).
Description:
This file determines links between file CNpub_for_priority
(restricted to years 2005-2010) and USapp_basedat. Specifically, we begin with the published
Chinese patents making a foreign priority claim based on a US patent application, and we match this claim to the patents in the
set USapp_basedat.
Note that in about a third of cases the priority claim made when filing
a Chinese patent application is based on the provisional application number in
the US, that ends up being different from the
application number eventually assigned to the patent. Therefore, we use the provisional application
number of each US patent application, as well as the actual application number,
in matching.
Specifically, we first match
on the actual application number and the exact foreign priority date. This is a type a1 match. Next we match on
the provisional application number and the exact foreign priority date. This is a type a2 match. Finally, we also consider matches on the
foreign priority year and the application number/provisional application
number, or the title and first inventor.
These are match_type=2a or 2b below. These account for a negligible share of all
matches (less than .5 percent).
We match observations CNpub_for_priority published 2005-2010 at a rate of 95.4
percent. The table at the bottom
provides the distribution of the various ways we can match. In about two thirds of cases, there is a
match on the application publication number and the exact date. In a third of the cases, the match is on the provisional
application number and the exact date.
We dont include any
matches for Chinese patents published in earlier years, because we have not
collected reliable information before 2005 for the provisional application
numbers on the published US applications.
(See the discussion for the file USapp_provisional.) Note in the paper we restrict attention to
Chinese patents published 2005-2010, where our coverage is very good.
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) |
|
app_publication_num |
Char |
20 |
13-32 |
link to US application (along with app_publication_kind). app_publication_num*application_kind is unique index of USapp_basedate |
|
app_publication_kind |
Char |
3 |
33-35 |
see above |
|
match_type |
Char |
2 |
36-37 |
=a1 if match to application number and exact foreign priority date =a2 if no match above, and match to provisional application number and exact foreign priority date =b1 if no match above, and match to title (40 characters), and either the first inventor name or the application number and the foreign priority year. =b2 if no match above, and match to title (40 characters), and either the first inventor name or the provisional application number and the foreign priority year. |
Table Showing Distribution of Match
Type by Year of Chinese Patent Publication
(We start
with the 1,080,629 foreign priority claims in CNpub_for_priority
and select out 217,879 cases where the foreign priority claim is from the US
and the publication year is 2005 or after.
We next select the 168,854 unique values of app_numfix. For each app_numfix,
we ask if the given app_numfix has at least one match
in USapp_basedat and the table below reports the
results.
|
|
Counts Of
Observations by Match Type and Year of
Chinese Patent Publication |
Percent
Distribution by Match Type and Year of
Chinese Patent Publication |
|
||||||||
|
Not Matched |
a1 |
a2 |
b1 |
b2 |
|||||||
|
Not Matched |
a1 |
a2 |
b1 |
b2 |
|
||||||
|
All By Year |
7,759 |
103,630 |
56,498 |
915 |
52 |
4.6 |
61.37 |
33.46 |
0.54 |
0.03 |
|
|
2005 |
2,247 |
14,437 |
6,363 |
165 |
9 |
9.68 |
62.17 |
27.40 |
0.71 |
0.04 |
|
|
2006 |
1,389 |
15,517 |
7,026 |
184 |
8 |
5.76 |
64.32 |
29.12 |
0.76 |
0.03 |
|
|
2007 |
1,201 |
18,296 |
9,355 |
122 |
4 |
4.14 |
63.14 |
32.28 |
0.42 |
0.01 |
|
|
2008 |
1,017 |
17,044 |
9,224 |
117 |
7 |
3.71 |
62.18 |
33.65 |
0.43 |
0.03 |
|
|
2009 |
1,100 |
20,708 |
12,819 |
166 |
8 |
3.16 |
59.50 |
36.84 |
0.48 |
0.02 |
|
|
2010 |
805 |
17,628 |
11,711 |
161 |
16 |
2.65 |
58.14 |
38.62 |
0.53 |
0.05 |
|