The USPTO released its most recent revision (5th Revision) to the MPEP last week, primarily modifying Chapter 2300 but also revision some additional sections to the Manual. According to the Blue Pages for the 5th Revision on the USPTO website, “[t]his revision consists of replacement pages for the Title Page in the front of the Manual, entire Chapters 100 – 900, 1100, 1300, 1500, 1700, 1800, 2100, 2200, 2500 and 2600, Appendices II – List of Decisions Cited, R – Patent Rules, T – Patent Cooperation Treaty, and AI – Administrative Instructions Under the PCT, and entire Index.” The Blue Pages further note that this newest revision was based in part on the following final rules: “(1) “Changes To Implement the Cooperative Research and Technology Enhancement Act of 2004,” which became effective on September 14, 2005; (2) “Provisions for Claiming the Benefit of a Provisional Application With a Non-English Specification and Other Miscellaneous Matters,” which became effective on November 25, 2005; (3) Changes To Implement the Patent Search Fee Refund Provisions of the Consolidated Appropriations Act, 2005,” which became effective on March 10, 2006; and (4) “Clarification of Filing Date Requirements for Ex Parte and Inter Partes Reexamination Proceedings,” which became effective on March 27, 2006.” The link below contains PDFs of each Chapter of both the 4th and 5th Revisions, as well as the 4th Revision in HTML format.

USPTO MPEP Webpage: LINK
MPEP Blue Pages (8th Edition, 5th Revision): LINK
MPEP Blue Pages (8th Edition, 4th Revision): LINK