SIR

a published statutory invention registration contains the specification and drawings of a regularly filed nonprovisional application for a patent without examination if the applicant - (1) meets the requirements of section 112 of this title; (2) has complied with the requirements for printing, as set forth in regulations of the Commissioner; (3) waives the right to receive a patent on the invention within such period as may be prescribed by the Commissioner; and (4) pays application, publication, and other processing fees established by the Commissioner. A request for a statutory invention registration (SIR) may be filed at the time of filing a nonprovisional application for patent, or may be filed later during pendency of the nonprovisional application.

-- see MPEP 1100 for more

See Statutory Invention Registration.

Signal Interface Ratio.