Hi, Jens.
This website below is probably one of the most famous website
in Japan to reference any patent news, patent infos, job postings, etc.
It's like a Japanese version of your patent referece website.
It's all written in Japanese, but you might wanna add this to your
web since it's link-free.
http://www.patentsalon.com/index.html
I will let you know if I find any websites which I think might be good for your web.