A quick way to find an international patent when you know the patent number is to simply copy the following URL and replace the last string (JP2002112728) with the patent you want:
http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=JP2002112728. This brings up the patent (JP2002112728 in this case - a Japanese patent dealing with bean curd or tofu). To get the full PDF file, click the small "Save Full Document" link near the top center of the page. There you go!