USPTO Publications (available on USPTO web pages)
General Information Concerning Patents (C21.26/2:yr.)
A Guide to Filing a Utility Patent Application (C21.14/2: UT 4)
A Guide to Filing a Design Patent Application (C21.14/2: D 46)
Manual of Patent Examining Procedure (MPEP) (C21.15:yr.)
Guide for the Preparation of Patent Drawings (C21.14/2:D 79) - Download zip file.
USPTO Patent Search Tools in Order of Use (available on USPTO web pages)
Index to the U.S. Patent Classification (C21.12/2:yr.)
Subject index to the Manual of Classification, below.
Manual of Classification (C21.12:yr.)
Choose 'USPC' (United States Patent Classification) for now. USPC will be phased out in favor of 'CPC' (Cooperative Patent Classification) to meet international harmonization efforts by 2016.
Classification Definitions (C21.3/2:cls.)
Choose 'USPC' button and use USPC classifications here as well.
U.S. Patents and Published Patent Applications (1790 to date)
Full-text U.S. patents with all drawings and specifications (on the Web, at www.uspto.gov )
Official Gazette of Patents (C21.5:vol./no.)
Weekly publication with brief bibliographic information, text description, and single drawing of newly-issued patents.