Website of Japan Patent Office. I don't want to post the URL here, I can just Baidu myself. )

Click the "IPDL" icon on the left side of the page. (IPDL is the digital library of industrial property rights in Japan)

Click on "Patent &; The utility model bulletin database enters the search page.

You can enter 12 numbers in the search page at the same time. You just need to enter 1 number. For example, you need to enter the number of 2004 1 12866: enter "a" in the first box to indicate the file type; Enter 2004- 1 12866 in the second grid, and then click the Search button.

Then click "JP 20- 1 12866 A" on the left side in the search results page that appears.