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- USPTO
The United States Patent and Trademark Office's Web site is a good place to begin a search or find out more information about patents and the Office's mission and activities. Search full text of patents since Jan 1, 1976. Patents issued from 1790 through 1975 are searchable only by patent number and current U.S. classifications. Full-Page images are available back to 1790. A TIFF image viewer is required.
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