For the publication and patent number, different number format applies depending on the patent-granting authorities, but for the IPsurvey databases the following standardised publication format is used
Is the country code
Read more about country specific number formats when adding references to IPsurvey.
Serial number. May be up to 15 digits. The first n may be a letter.
Optional kind code. May be 1 or 2 characters.
In general the publication number is typed without spaces and with or without the kind code (optional). A dot is separating the patent number and kind code.