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·搜一搜.cn/US Patent Full-Text Database Boolean Search

US Patent Full-Text Database Boolean Search
美国专利全文数据库

http://patft.uspto.gov/netahtml/PTO/search-bool.html
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Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification.
When searching for specific numbers in the Patent Number field, patent numbers must be seven characters in length, excluding commas, which are optional.