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.
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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