"Application for revocation", there is no such term. There is a similar "request for invalidation", but this is submitted to the Patent Reexamination Board after authorization. However, reasons and evidence need to be provided.
In addition, "similar products" of other companies were already on sale "before authorization". The basis for judgment should first be based on whether such products were already on sale before the date of application, rather than based on The time point before authorization is that there is no evidence to prove that what he applied for has been made public before the day he applied. In addition, "similar products" is vague, and it is necessary to compare specific products with the specific content in the claims of the patent he applied for.