USPTO Patent 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)
Design Patent Application Guide (C21.14/2: D 46)
Patent Attorneys/Agents Search
Manual of Patent Examining Procedure (MPEP) (C21.15:yr.)
Other useful resources
Patent classification is a system for organizing all U.S. patent documents and other technical documents into specific technology groupings based on common subject matter.
Patent Public Search has two user selectable modern interfaces that provide enhanced access to prior art. The new, powerful, and flexible capabilities of the application will improve the overall patent searching process.
Official Gazette of Patents (C21.5:vol./no.)
Weekly publication with brief bibliographic information, text description, and single drawing of newly-issued patents.