PTDL Optical Disc Products

Optical Disc Products at Patent and Trademark Depository Libraries

The U.S. Patent and Trademark Office produces a series of optical disk products containing U.S. patent and trademark information. This series of products, called CASSIS, is provided to all Patent and Trademark Depository Libraries (PTDLs) which provide access to the public without charge. PTDLs are permitted to collect fees for printing records and documents.

CASSIS products can be purchased on subscription. Check the Products and Services Catalog for more information.