Is it necessary to give a case of defense?

This is necessary.

Refers to the first notice of examination issued by the patent office, waiting for a reply. General invention patents will receive relevant examination opinions, and the time limit for replying to the preliminary examination opinions is 4 months. Applicants need to prepare materials according to the audit opinions within the specified time.

The deadline is four and a half months from the date of publication, after which the patent will be regarded as revoked. After receiving the reply of the first examination opinion, the Patent Office will continue to examine and the applicant will continue to wait.