In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7264746 | Urea based granule blend for ice-melting and reducing granule caking A urea based granule blend configured for ice-melting and reducing granule caking, the blend comprising substantially pure urea granules comprising an ice-melting property and formaldehyde coated urea granules configured for reducing granule caking, wherein the blen... | 09/04/2007 |