The FreePatentsOnline search engine is one of the most powerful, fastest and easiest patent search engines on the web. It allows advanced search techniques such as word stemming, proximity searching, relevancy ranking and search term weighting to help you find exactly what you are looking for. And, our account features let you organize, annotate and share documents, and Alerts let you instantly be notified when new documents of interest are published.
Full text of all U.S. patents (keyword searchable) from 1976 to date, and published patent applications from March 2001 to date. Patents from 1790-1975 are image files, and searchable only by patent number, issue date, and current classification.
Can limit to patent as document type. Cited patent search will retrieve citing articles, US patents, and foreign patents. Can create alerts, including a cited patent alert. Can export records into RefWorks.
Go to advanced search to limit to patent fields, or limit searches by publication type. Can export patent references to RefWorks!
AP=Patent Applicant Data
PA=Patent Application Data
PR=Patent Priority Data