What happens if a patent application is filed without all the pages of the specification?

If a patent application is filed without all the pages of the specification, the USPTO will notify the applicant of the missing parts. The MPEP refers to this situation:

See MPEP § 601.01(d)-(g) where the application is filed without all the pages of the specification, without at least one claim (nonprovisional design application), without drawings, or without all the figures of the drawings.

For applications filed before September 16, 2012, a supplemental oath or declaration by the inventor may be required to identify the missing item and indicate that it accurately describes the invention. For applications filed on or after September 16, 2012, an additional oath or declaration is generally not required.

The applicant will be given a time period to submit the missing pages. If the missing pages are not submitted within the specified time, the application may be deemed incomplete and not accorded a filing date until the missing parts are received.