chem 4432-chemical plant design

canadian patent records from 1869 to present; full-text documents from 1920-.

u.s. patents, 1790 to present, published applications, 2001 to present.
patents prior to 1976 can be retrieved by number, date and classification. tiff viewer required to view/print patent documents.

browseable index to the us patent classification system

the world international patent office does not issue patents, but allows inventors to apply for patent protection simultaneously in many countries as dictated by the patent co-operation treaty. the patentscope database is an interface to search international patent applications from 1978 to present.

publication coverage: 1836 - present

a database of chemical patent information created by the firm surechem, now made publicly available by the european bioinformatics institute (ebi). rather than relying on search terms, surechem allows users to search by drawing the chemical structure. users must create an account.