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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 | Title | Issue Date |
| 4976860 | Conjugated polymer-cation exchanger composite membrane Disclosed is a conjugated polymer-cation exchanger composite membrane suitable for a charge-mosaic membrane which is easily prepared and has excellent mechanical or chemical strength and good properties for charge-mosaic membrane. The composite membrane o... | 12/11/1990 |
| 4824604 | Detergent composition Novel detergent composition comprises one or more of N-acyl-N-hydroxyalkylglycines of the general formula (I) or salts thereof: ##STR1## The composition has a very good resistance to hard water, low stimulativeness, and good detergency. It is thus su... | 04/25/1989 |
