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ChE381 & 382: Process Evaluation and Chemical Systems Design I & II

Public Access (Free) Patent Websites:

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.

  • U. S. Patent and Trademark Office: Patent Search: Contains all U.S. patents and patent applications, as well as classification and indexing tools. Patents since 1976 are searchable by keyword, inventor, assignee, classification code and numerous other parameters. Results include claims, current classification number(s), and PDF image of complete patent, including drawings.  Older patents (pre-1976) available as PDF images only, and must be searched either by patent number or classification.  Downloading patents and printing from this site have been greatly simplified in the past year. 
  • Google Patents 
    Contains all U.S. patents, U.S patent applications, and European patents. Older patents include many optical character recognition errors.
  • Patent Lens 
    Contains US patents from 1976+, European, World, and Australian patents. Contains patent applications from U.S., World, and Australia.
  • Patent Fetcher If you know the patent number, this is a fast way to download a patent. Limited to 5 downloads in one 24 hour period.
  • Espacenet 
    Espacenet offers free access to more than 70 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.

Other Patent Sites - Not Free

  • SciFinder 
    indexes chemical patents as well as the chemical research literature.  Registration is required.

Patent Searching Techniques

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.

Using SciFinder


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.

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