Thursday, May 5, 2011

IPCs Missing in patstat

One important piece of information about patents is international patent classification (IPC) that "provides for a hierarchical system of language independent symbols for the classification of patents and utility models according to the different areas of technology to which they pertain."
In other words allows to assign a technological area to a patent.

The bad news is that a big number of applications in patstat have no IPC in TLS209 table (where they are supposed to be).

Overall in patstat ediction 2010/10 about 20% of application ids (12.697.090 out of 66.226.956) have no match in IPC table (but 589.586, an addictional 0,8% have a 4 digits only IPC).
This figure must be cleaned removing D application kinds, 9999 filing years and other oddities.
Anyway if we consider only application kind A and W (patents of invention and PCTs) along with years 1990 to 2008 we still have a 7% of applications without IPC (1.715.808 out of 23.825.272). 


These are detailed results by application authority, filtered for applications authorities with more than 1000 applications and where no ipc rate is equar or greater than average.
We notice some data about some EU national offices like Sweden UK and Italy have 1/3 or more patents with no ipc so we may not rely on such data.


Appl Auth
Appl. No ipc
Tot appl
Rate
'AR'
20030
36979
54%
'AT'
5179
34363
15%
'AU'
102908
591748
17%
'BE'
2515
17287
15%
'BG'
1446
9901
15%
'CH'
17218
45233
38%
'CL'
519
3809
14%
'DK'
11734
36388
32%
'DZ'
146
1237
12%
'FI'
18120
85491
21%
'GB'
221306
605352
37%
'HK'
6011
58724
10%
'HU'
8312
64246
13%
'IE'
3224
22243
14%
'IL'
27983
112905
25%
'IN'
10123
30559
33%
'IS'
419
5042
8%
'IT'
113333
173949
65%
'LV'
660
4748
14%
'MY'
1337
1572
85%
'NO'
9596
112246
9%
'NZ'
8531
72008
12%
'PH'
185
2280
8%
'SE'
35171
105096
33%
'SG'
8625
47499
18%
'TR'
2786
11423
24%
'TW'
26696
196766
14%
'UA'
1799
24311
7%
'UY'
1018
5700
18%
'YU'
1319
2552
52%
'ZA'
57501
129891
44%
Total
1715808
23825272
7%

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