ATTENTION: We are currently in the process of moving to our new website located at
Please make note of this and update your bookmarks accordingly. We apologize for any inconvience.

US Patents on the web and in the library

United States Patent Databases

U.S. Issued Patents and Published Applications are searched separately.

(Images are in TIFF format. See right box for link.)

Patent Application Information System (PAIR) gives status and patent history.

Patent Assignments Database
shows assignor and assignee data changes after issue date. 

Patent Search Templates give recommended databases that examiners use to search for prior art.

More Cassis Patent Databases are available at Engineering Library.

Lexis-Nexis Patents are licensed for Purdue users only.  

U.S. Patent Classification

United States Patent Classification (USPC) tools

Full Text Patents


FreePatentsOnline retrieves U.S. patents.   

Google Patents

Free printing of USAPat and USAApp are available on DVD (TIFF format) at the Engineering Library’s Patent and Trademark Depository Library

PubWest (Only accessable in the ENGR Library with staff assistance)

Expert Help

Patents: Guidance, Tools & Manuals (USPTO)
Manual of Patent Examining Procedure (USPTO) guides the examination of U.S. patents. 

Inventor Assistance Center (USPTO) staffed by retired examiners answer general questions about examining policies and procedures.

Training Resources

Inventor Resources (USPTO)  uses a question and answer format.  The site also includes “On-Line Chat Transcripts,” and “FAQs from Previous Chats.” 

Patent Search Tutorial (Pennsylvania State University). 

Patent Searching: Tutorial and Guide to Online Resources and Information (University of Texas at Austin)
Independent Inventor Tutorial Training Course is available on Patent and Trademark Workstation in Engineering Library.

STOPFAKES.GOV is a government program to help small businesses prevent intellectual property piracy.  More in-depth information and country toolkits are available.