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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.
PhoneSpell.org Search
PhoneSpell.org - What does your phone number spell? Use this add-on to quickly look up any phone number (up to 16 digits) and see what words it can spell.
ABA Number Lookup
Free ACH/ABA number search engine. Search for bank names by routing number, or find a routing number using a bank name.
To create your own collections, you must have a Mozilla Add-ons account.
