U.S. Patent Search
A patent gives an inventor the right to exclude others from making, using, selling or importing his invention. An invention can be patented based upon its useful features (a utility patent) or its appearance (a design patent). The links below are patent searches you can run on the U.S. Patent and Trademark Office web site. They are not a substitute for a thorough patent search provided by intellectual property counsel, but they are a good starting point if you have an invention you believe may be patentable.
USPTO Global Dossier–International Patent References for Patents or Published Patent Applications:
Online access to the file histories of related applications from participating IP Offices, which currently include the U.S., Korean, European, Chinese and Japanese Patent Offices. By using this service, users can see the patent family for a specific application, containing all related applications filed at participating IP Offices, along with the dossier, classification, and citation data for these applications. This service also provides Office Action Indicators to help users identify applications that contain office actions.”