After the Trademark Office makes a decision to declare a registered trademark invalid, it will notify the parties concerned in writing. If a party refuses to accept the decision of the Trademark Office, he may apply to the Trademark Review and Adjudication Board for reexamination within 15 days from the date of receiving the notice and give a reply. 1, highlighting the key points: in the process of trademark invalidation defense, when arguing whether the trademark is similar, the respondent can elaborate on the conceptual meaning of the trademark and extend it to the sample graphics of the trademark to point out its differences; When answering whether the goods are similar, we can explain them from the nature of the goods. There are obvious differences in products of different projects, which will not affect or mislead consumers. 2. Be targeted: when replying, refute the objections one by one. Of course, other irrelevant contents need not be mentioned, so as not to let dissidents seize more loopholes and cause more problems. 3. Highlight the advantages of trademarks in defense: highlight the innovation and differences of trademarks in defense. If you use the trademark first, you can also provide relevant certificates to increase your chips.