| Patent Number |
Title Of Patent |
Date Issued |
| 6794504 |
Chlorinated copper phthalocyanine pigments |
September 21, 2004 |
| Incipiently chlorinated copper phthalocyanine pigments having a chlorine content of from 10 to 40% by weight and a dispersion harshness .ltoreq.10 in LDPE are useful for coloring plastics. |
| 5944887 |
Transformation of crude halogenated copper phthalocyanine pigments into a useful pigmentary stat |
August 31, 1999 |
| A process for transforming crude halogenated copper phthalocyanine pigments having a chlorine content of from 4 to 50.3% by weight into a useful pigmentary state comprises treating the crude pigment at elevated temperature with a liquid acidic aromatic organic medium in the presence |
| 5728888 |
Preparation of hydroxylated benzophenones |
March 17, 1998 |
| Hydroxylated benzophenonens are prepared from completely or partially methylated hydroxybenzophenones by reacting these methyl ethers with AlCl.sub.3 and subsequently hydrolyzing with water, the reaction being carried out in the presence of one or more compounds from the class of ure |
| 5569758 |
Preparation of metal-free phthalocyanines |
October 29, 1996 |
| A process for preparing metal-free phthalocyanines which can carry up to 16 halogen atoms, cyano groups, carboxyl groups, sulfo groups, C.sub.1 -C.sub.18 -alkyl groups and/or aryl radicals as substituents by reductive cyclization of ortho-phthalodinitrile substituted ortho-phthalodinitri |
| 4179667 |
Circuit arrangement for adjusting the volume of an automobile radio receiver in dependence on ro |
December 18, 1979 |
| The invention relates to a circuit arrangement for adjusting the volume of an automobile radio receiver in dependence on road noise, comprising a microphone which picks up the noise and emits an electric signal which is conducted by way of an amplifier, a rectifier and a time-controlled |
