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Under the Patent Prosecution Highway (PPH), an applicant receiving a ruling from the Office of First Filing (OFF) that at least one claim in an application filed in the OFF is patentable may request that the Office of Second Filing (OSF) fast track the examination of corresponding claims in corresponding applications filed in the OSF. PPH will leverage fast-track examination procedures already available in the OSF to allow applicants in the OSF to obtain corresponding patents faster and more efficiently.
As of May 25, 2010, the USPTO has eliminated the fee for the petition to make special under the PPH programs. For further information, please see the Federal Register notice available here.
For more information see these Patent Prosecution Highway Resources: