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Blankets are in the public domain; they have existed since since humans could first manipulate materials to suit their needs. As such, they cannot be patented. Innovations on the blanket, such as the electric blanket, may qualify for a patent. George Crowley, an American inventor, is recognized as the inventor of the modern electric blanket.
Source:
New York Times: George Crowley, 80, Developer Of The Modern Electric Blanket
United States Patent and Trademark Office: Conditions For Obtaining A Patent
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