Patents are considered as waivers.

Generally, after the Patent Office sends a notice and sends it to 15, if the applicant does not give feedback, it will be deemed as having received the letter, and the corresponding time limit will be extended. No matter how the letter is sent, the applicant should pay attention to follow up the patent process. Since the notice can be received before and after, indicating that the mail is unblocked, then the middle problem lies in the post office, and it is certain that the post office will give a statement that whoever delivered it and signed for it can be found. If the post office has forged receipts, it will be quite bad.