Derwent World Patents
Choose Your Options
Use only the search options that you need--leave the others blank.
Enter words that describe the subject of the patent. For different word endings, use the ? wildcard: SUPERCONDUCT? Combine words to get specific information. Example: SUPERCONDUCT? AND (INSULATION OR THERMAL SHOCK)
Enter an international class code just as it appears in a patent, with all punctuation. For example, class code G08C-021/00.
Enter the name of the assigned owner. For example, SILICON GRAPHICS. Do NOT include words like Corp., Inc., etc.
Enter the last name and the first initial. Use a wildcard after the first initial for more complete search results. Example: MOORE T? (To search by the company that owns the patent, use Search by Patent Assignee.)
Patent or Application Number
Enter the 2-letter country code followed by a space and the number just as it appears in the patent or citation, with all punctuation. For example, patent number US 5,251,234 or application number EP 93200044. To display a list of country codes, click Country Code List.
Note about U.S. application numbers: U.S. application numbers are reused every several years. To search by U.S. application number, if you know the application year, select the year from the Application Year drop-down list.
Priority Only (Application Number)
Check the Priority Only box to restrict application number searches to the priority application only.
Enter the two-letter Country Code. For example, to search patents from the U.S. and Canada, enter US OR CA.
Select the box if you want records containing images.
Patent or Application Year
Select the All Years or From option. Choose the All Years option for the fastest processing. If the From option is selected, select a starting year and an ending year from the drop-down lists.
Derwent World Patents Index. Coverage of 14 million patent documents from 40 patent issuing authorities around the world with more than 20,000 new documents added each week. Pharmaceutical patents coverage 1963+, Agricultural 1965+, Polymer & Plastic 1966+, All Chemical 1970+. All subject areas covered from 1974 to present.