When applying for a patent, what is the most common reason for rejection by the US Patent and Trademark Office?

The most common reasons for the US Patent and Trademark Office's rejection are as follows: the trademark is similar to the existing registered trademark or the trademark in the previous application, which is the most common and serious reason for rejecting the registration. Trademark describes the goods and services for which registration is sought, which is a common legal reason for refusing registration. This trademark is a common name for goods or services. Trademarks are personal surnames. Due to the lack of distinctiveness, it cannot be used as a trademark of goods or services. Trademark has geographical description or geographical description error. Trademark law prohibits the use of trademarks, such as those consisting of foreign flags or badges or immoral, deceptive or defamatory elements.