Free patent lookup
Look up many different patents for free. Receive free data when using patent number to lookup patents.Patent for concrete screw
Patent number 3,902,399 was created in 1975 for an invention of a screw that could be used in concrete.Patent for knife sharpener
Patent number 3,902,275 patented the invention for a knife sharpener. Search other utility patents for free with the ultimate patent dashboard.Patent Rank Homepage
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Think you have the next big invention? Want to patent an idea? Find out if it could be patented and other patented inventions that may be similar.