Explanation of F-Term Classifications
F-Term is a multidimensional classification system consists of a theme and multiple viewpoints. There are about 2,600 Themes which can be further divided to form 380,000 different classifications. The notation of F-term is shown below.
Which Patent Classification System should we use to search Japanese patent?
There are mainly two international patent classification systems that are IPC and CPC. There is another Classification system which could be usable for searching Japanese patents is F-Term. F-Term is a very complex Classification that is developed by Japanese patent office for only Jese patent. It has a very different structure then the other classification system (as shown above). So, there is a need of comparison between IPC/CPC and F-TERM classification system.
Need of Classification based search for Japanese Patents?
The Japanese patents are foreign language patent translated into English language. As a result the keyword based searching will
not be a good way. Because there are a lot of jargons used which come due to translation. As, we know Patent classifications are language independent. Patent Classification automatically removes all the jargons.
Comparison of IPC/CPC and F-Term Classification based searching of Japanese Patents
To compare the IPC/CPC and F-Term based search. We have to take an examplary claim:
1. A liquid immersion photolithography system comprising:
To Search for the above invention disclosure:
1. We have to extract relevant IPC/CPC and group them and search accordingly
2. We have to extract relevant F-Term and group them and search accordingly
1.Searching using IPC/CPC classification (for demonstration we also use keyword+classification based
search to make it broader):
2. Searching using F-Term classification:
With above analysis it could be seen that there are almost 106 results out of 360 results which are not retrieved using IPC/CPC and IPC/CPC+keyword based search. So, it is necessary to use F-Term classification to search for Japanese patent.
F-Term have more division (380,000 entries) means we can do more specific search. There are Multidimensional viewpoints for every theme. F-Term classifications are very well structured for Language independent search. So, The F-Term classification based search is very successful for Japanese patents.