Which method is considered not recommended for customers from treaty countries for filing address changes?

The method identified as not recommended for customers from treaty countries for filing address changes is the submission of change of address information on paper. This approach is discouraged because it can lead to delays and increased chances of errors. The USPTO aims to streamline processes and enhance efficiency in communications, and electronic methods provide a more direct and faster means of updating information.

Filing changes electronically, whether through online form submission or other digital means, allows for quicker processing and confirmation. The handling of paper documents can result in longer processing times due to manual sorting and data entry, and it may increase the risk of lost documentation or miscommunication.

Additionally, options like email notifications or faxes are generally more reliable for immediate communication compared to waiting for postal delivery associated with paper submissions. Therefore, the reliance on electronic systems supports the USPTO's goal of modernizing and expediting service to users in treaty countries.