When there is a typographical error in the patent certificate, the patentee may return the certificate and request the Patent Office to correct it. If the patent office verifies that it is a typographical error, it shall correct it and issue a replacement card to the patentee. The original certificate is marked with the word "changed" and then kept in the patent application documents.
If the patent certificate is lost, it will not be reissued unless it is caused by the Patent Office.
Therefore, after the patent certificate is lost, it is impossible to apply for a replacement.
In addition, the patent certificate can be replaced under the following circumstances: the patentee changes after the patent dispute, the patent certificate is damaged, the patent certificate is printed incorrectly, and the patent office loses the patent certificate. At the same time, the original certificate should be handed in and stored in the patent application file.