1. If the clerical error is only a word error, such as "should" being mistaken for "English should", it will be obvious at a glance that it is a clerical error that does not affect the expression of meaning, and its validity will not be affected at this time;
2. If the word "no" is added or subtracted by mistake, it may completely affect its effectiveness.
In either case, once a clerical error is found, you should contact the Patent Reexamination Board as soon as possible and make an amendment according to the corresponding laws and regulations as soon as possible.