There is no such procedure as publicity period in the field of invention patents, but there is such a procedure for trademarks.
You mean the procedure that an invention patent is deemed to be withdrawn three years after it is automatically disclosed 18 months after the application, and there is no need for substantive examination.
In fact, no matter whether you ask for disclosure voluntarily before 18 months or automatically after 18 months, as long as it is disclosed, it will always be in an open state, whether you withdraw it or not.
2. From the publicity period to the authorization date, can others cancel my patent?
Anyone's opinions on an application for a patent for invention that does not conform to the provisions of the Patent Law shall be kept in the application documents for the examiner to consider when examining the substance. If it is the public opinion received after the examiner issues the notice of patent grant, it need not be considered. The handling of public opinions by the patent office does not need to inform the public who put forward opinions.
If other people's opinions are really well-founded, you can authorize them first.
Since the date when the patent administrative department of the State Council announced the grant of the patent right, any unit or individual may request the Patent Reexamination Board to declare the patent right invalid if it considers that the grant of the patent right is not in conformity with the relevant provisions of this Law.
If the invalid reason of others is really established, you can invalidate your patent right after you authorize it.
3. Is it protected if someone infringes at this time?
After the publication of an application for a patent for invention, the applicant may require the entity or individual who exploits the invention to pay an appropriate fee.
If you don't pay, you can only file a lawsuit after authorization, and pay attention to the calculation of the limitation of action.