Under Rule 1.48 for Non-Provisional applications, which of the following is a type of correction allowed?

The addition of inventors due to an error at the time of filing is an allowed correction under Rule 1.48 for non-provisional applications. This rule specifically addresses situations where an application may have initially listed the inventors incorrectly or omitted some inventors entirely due to misunderstanding or oversight.

Rule 1.48 permits applicants to correct the inventorship of an application, ensuring that all individuals who contributed to the invention are properly credited as inventors. This correction is crucial not only for the validity of the patent rights but also for ensuring that proper ownership and collaboration are recognized among the inventors.

While other choices may appear relevant, they do not align with the types of corrections permitted under this specific rule. For instance, deleting claims, altering the title, or including additional fees do not fall under the purview of inventor corrections and are instead addressed under other provisions or filing requirements. Thus, the option regarding the addition of inventors due to an error at the time of filing is the correct choice in the context of Rule 1.48.