Documents filed via EFS-Web Contingency as part of the submissions previously listed must meet the same file format requirements established for EFS-Web, e.g., file size and PDF embedded-font requirements. The same file validation performed in EFS Web will be performed in EFS-Web Contingency. Similar to EFS-Web, EFS-Web Contingency will provide an Electronic Acknowledgement Receipt that establishes the date of receipt by the USPTO of an application or document submitted via EFS-Web Contingency. The applicant is not required to, and should not, resubmit the application or document that was submitted via EFS-Web Contingency when the primary portal to EFS-Web is once again available. Any resubmission of an application will result in filing a duplicate application and, if applicant pays the filing fees again when submitting the duplicate application, no refund will be provided. 35 U.S.C. 42.