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PatentlyUseful(tm) Patent Application Number Search Engine
Find a Published Patent App at the USPTO by number. Use the EXACT number and DON'T use the leading "US" (e.g. 20040243699 works but US20040243699 doesn't).
Assign the keyword "pa" to this and typing "pa 20040243699" will get you that app.
PatentlyUseful(tm) Patent Number Search Engine
Search the United States Patent and Trademark Office (USPTO) by Patent Number.
To create your own collections, you must have a Mozilla Add-ons account.