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 |
| 4092344 | Cyclohexenyl resorcinol derivatives Novel 1-hydroxy-3-alkyl-6,7,8,9,10,11-hexahydrodibenz[b,d]oxepins are prepared from cyclohexenyl resorcinol derivatives and are useful as central nervous system depressants.... | 05/30/1978 |
| 4087410 | 5-(Tertiary alkyl) resorcinol preparation and intermediates therefor 2,6-Dimethoxyphenol reacts with a tertiary carbinol in the presence of an acid to provide exclusively a 1-hydroxy-2,6-dimethoxy-4-tertiary alkyl)benzene, which when reacted with a halogenated disubstituted phosphite affords a 2,6-dimethoxy-4-tertiary alky... | 05/02/1978 |
| 4081450 | 1,3,4-Trisubstituted-4-arylpiperidines and their preparation Novel 1,3,4-trisubstituted-4-arylpiperidines are prepared by alkylating a 2,3-disubstituted-3-arylpyrroline to afford a 1,2,3-trisubstituted-3-aryl-1-pyrrolinium salt, reacting the salt with diazomethane to provide a 1,2,3-trisubstituted-3-aryl-1,2-m... | 03/28/1978 |