A more thorough explanation:

Definition: A reissuable error is a type of mistake found in a patent that can be corrected by filing for a reissue patent. This type of error is not intended to deceive anyone and can be fixed without invalidating the entire patent.

Example: Let's say a patent was granted for a new type of smartphone case, but the patent mistakenly included a feature that was already patented by someone else. This mistake would be considered a reissuable error because it was not intentional and can be corrected without invalidating the entire patent.

Explanation: Reissuable errors are common in patents because they can be very complex and technical. These errors can include mistakes in the claims, drawings, or specifications of the patent. By allowing for reissue patents, the patent system can correct these mistakes and ensure that the patent is valid and enforceable.