“However beautiful the strategy, you
should occasionally look at the results.” -- Winston Churchill (British
Orator, Author and Prime Minister during World War II. 1874-1965)
Google® Patents is quick and easy. HOWEVER, there is a time lag between USPTO – U.S.
Patents & Trademarks Office - and Google® Patents. If absolute currency is important to you, use
USPTO.
Commercial vendors of patent information like Derwent source their patents from
USPTO and other national patent agencies.
USPTO is free to the public.
Derwent charges money. HOWEVER, Derwent adds value to the USPTO data by
correcting misspellings, OCR errors and other typos. If you are conducting a comprehensive search
before filing a patent, the added value is worth the added expense.
Read these and other patent searching tips in a very useful Patent Searching cheat
sheet (http://library.caltech.edu/learning/classhandouts/PatentSearching.pdf)
produced by Caltech Library. It is short, to the point, and absolutely free.
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