Several English translations in the application form of the United States Patent Office.

1. Power of attorney for applying for American patent;

2. Before USPTO. Is an idiom meaning "to the United States Patent Office ...", for example:

Submit a new US application to USPTO. In other words, "submit a new application to the US Patent Office"

Pay the 3.5 anniversary fee before USPTO. This means "paying an annual fee of 3.5 years to the US Patent Office".