The USPTO’s Electronic Priority Document Exchange (PDX) Program relieves Applicants of the burden of submitting certified copies of their priority documents. Rather, the Applicant can simply submit the country in which the priority application was filed, its filing date, its serial number, and an access code. The USPTO can then electronically retrieve the priority document and identify it by its serial number.
The USPTO has guidelines for these serial numbers.
Recently, we learned that the USPTO sometimes identifies the priority document with a different serial number than the actual serial number of the document.
This situation can arise when the priority document is a design application, for example. When we learned of this issue, the priority document originated from Japan. Japanese design applications have serial numbers like 202X-YYYYYY. Therefore, the serial number looks like a Japanese utility application, which follows a similar naming pattern.
It appears a serial number alone is sufficient for the Japan Patent Office to determine whether the subject application is a utility application or a design application. However, the USPTO additionally requires that Applicants identify whether the subject application is a utility application or a design application. Perhaps the reason is that the USPTO must access a different database or use a different protocol for retrieving design applications from the JPO.
In any case, when the USPTO successfully retrieves a Japanese design priority application, the USPTO adds a cover sheet with a different serial number than the one on the priority application itself. Specifically, the USPTO serial number will reflect the format of the PDX guidelines, not the format of the priority document.
So, be sure to check the priority document serial number on the Application Data Sheet for compliance with the PDX guidelines.