In the European Patent Office, what do the characters A, A 1, A2, B, B 1, E, Y mean after the published patent number? How to judge whether its patent is authorized?

A- Patent application instructions that have not been substantially examined and have not been granted a patent right within 0/8 months from the European patent application date (or priority date).

A 1- European patent application specification and search report

A2- No search report attached.

B- European patent specification

B 1- European patent specification published after the patent applicant submits a request for substantive examination within 6 months from the date of publication of the search report and passes the actual examination and authorization announcement.

E- appears in the retrieval report, indicating that the earlier application or patent published on or after the international application date, that is, the conflicting application, can affect the novelty of this application in a single article.

P- appears in the retrieval report, indicating that the publication date is earlier than the international application date but later than the required priority date, that is, the document that needs to verify the priority.