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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.

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Number of patents: 1
Last date: November 16, 1993

Number	Title	Issue Date
5262164	Sustained release compositions for treating periodontal disease This invention relates to compositions and methods for treating diseases of the oral cavity in humans and lower animals using a glycerol monooleate gel for releasing drugs in the oral cavity....	11/16/1993