The USPTO has produced Interim Guidance on Patent Subject Matter Eligibility. These updated guidelines are in light of recent Supreme Court decisions, including Alice Corp. v. CLS Bank. The guidelines are for use by USPTO personnel to use when determining eligibility under 35 U.S.C. 101. The guidance is meant to supplement the Preliminary Examination Instructions, which were released in June, following the Alice Corp.case. The USPTO is seeking public comment on the guidance through March 16, 2015. The Interim Eligibility Guidance can be found here.
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