Patent Links
The United States Patent and Trademark Office – Patents
The United States Patent and Trademark Office – Trademarks
The United States Copyright Office
To search patents, go to one or more of the following sites (different sites have different patents/applications/publications and different integrity issues):
United States Patent & Trademark Office Patent Database
To search trademarks registered in the US Patent and Trademark Office, go here:
United States Patent and Trademark Office Office of Data Management
Patents for sale or to be licensed can be advertised at the following website:
United States Patent and Trademark Office of Data Management
Scroll down if necessary to the “Listing Patents for Sale or License in the Official Gazette (OG)”