The easiest is to search is Google Patents, which has the most efficient search engine. Next is Patent Lens, where you can view foreign, US patents and patent applications. The U.S. Patent and Trademark Office search engine is less user-friendly. However, once you have determined the likely classification number(s) for your patent, The U.S. Patent and Trademark Office site is the most authoritative for searching by Patent Class.
Cooper Union's Patent Searching page is in the process of being revised.
Until it is available, we suggest that you see the Patent and Trademark Searching Guide maintained by the Engineering Library at the University of Washington.
Step one: register for your own login. Contact Julie Castelluzzo in the Library for the registration link.
IMPORTANT NOTE: When connecting to SciFinder from anywhere away from the Cooper Union campus, be sure to use a link with the Cooper proxy prefix, such as on this guide or on the main Library website.
The Cooper Union Library
7 E 7th St.
New York, NY