You can check it on the Japanese Patent Office website. ?
When checking, if the special opening is followed by four digits, then just ignore the special opening two characters and the - sign. The four digits are the year, and the following six digits are It is required. For example, when you search for this patent, directly fill in 2004230527 and fill in A for the type.
If the special character is followed by "平" or "Shō" + one digit or two digits, then it will take a little trouble. The Heira and Show are the Japanese era names. If it is a draw, then 1988 needs to be added to this number, and if it is a draw, 1925 needs to be added.
Content expansion:
Patent literally refers to exclusive rights and interests. The word "patent" comes from the Latin word Litterae patentes, which means a public letter or public document. It was used by medieval monarchs to prove certain privileges, and later referred to the exclusive rights certificate signed by the British king himself.
In modern times, a patent is generally a document issued upon application by a government agency or a regional organization representing several countries. This document records the content of the invention and creation, and is produced within a certain period of time. A legal state in which a patented invention can generally be implemented by others only with the permission of the patentee. In my country, patents are divided into three types: invention, utility model and design.
Patent documents, as the most effective carrier of technical information, contain more than 90% of the latest technical information in the world, 5-6 years earlier than the information provided by general technical publications, and 70%-80% of inventions Creations are only disclosed through patent documents and are not found in other scientific and technological documents. Compared with other document forms, patents are more novel and practical. It can be seen that patent documents are the largest source of technical information in the world. According to empirical statistical analysis, patent documents contain 90%-95% of the world's scientific and technological information.
In November 2016, the China Patent Office accepted more than 1.1 million patent applications from domestic and foreign applicants in 2015, accounting for nearly 40% of the global total, exceeding the United States, Japan and South Korea combined.