This guide directs you to materials that will help search free patent sources
Administered by Library of Congress
Is a property right for a limited period of time, usually 20 years
- Trade Secrets
Contain information that companies keep secret from competitors
Distinguish goods and services
Charlotte Erdmann has served as a patent librarian fellow with the US Patent and Trademark Resource Center (formerly Depository Library Program) and has served as president of the related national association. Contact her here.
- 7 Step Search Strategy - (USPTO - PTRC)
Provides a brief one page guide to searching and reviewing patents. It is focused on USPTO databases
- U.S. Issued Patents and Published Applications
Are two separate databases and are searched separately. Issued patents are available from 1789-present and published applications are available since March 2001. You may now easily download PDF versions of both documents
- PubWest and PubEast
Searches databases that U.S. patent examiners use at the Patent Office. The system is very flexible and is available at the Engineering Library only. Contact Charlotte Erdmann for an appointment.
- 7 Step Search Process with Examples (2014)
Contains a new guide incorporating the US and CPC Classificaitons
- Chemical Abstracts (SciFinder Scholar)
Is helpful for chemical U.S. and international patents as well as journal articles, conference papers, and book chapters. It is licensed for Purdue users only.
- Derwent Innovations Index
Contains patents from many countries organized by patent families. Most topics go back to the 1960s. The database uses International Patent Classification and Derwent Classification. Chemical structure searching is available. This is a subscription database for Purdue users.
- Lexis-Nexis Patents
Permits full-text and fielded searching. It is licensed for Purdue users only.
- Patent Lens
Offers keyword and gene sequence searching for patents since 1976. Full-text is in PDF.