US patents classification

There are three major steps to a patent search. (1) There is the US Patent Classification System that is a sort of subject index to all patents, (2) CASSIS is a computerized software information system provided by the USA patent office, and (3) review the patent that takes time involves the weekly official worldwide gazettes, magazines, etc. There are many ways available to search the patent database in both US and worldwide, but one web that is particularly useful to the novice or occasional searcher is one offered by IBM locate at http //www patents.IBM.com... 

A related database is provided through Chemweb the IFI Claims database (http //www.chemweb.com/databases/ claims) provides text-searchable information on claims in US patents from 1950 (chemical patents) and 1963 (utilities patents) to the present day. As well as non-specific search methods, the interface on Chemweb permits searching by Boolean combinations of title, inventor, exemplary claim(s), assignee, patent number, application number, US patent classifications or international patent classifications (IPCs). Search terms may be stemmed for additional flexibility. 

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