| Patents for C09B 41 - Special methods of performing the coupling reaction (551) |
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| 10/17/1989 | US4874847 Process for the diazotisation of primary aromatic amines which are sparingly soluble in water |
| 07/26/1989 | EP0324943A2 Water soluble black trisazo dyes |
| 07/04/1989 | US4845638 Method of eliminating excess nitrite in diazotisation solutions |
| 06/22/1989 | DE3839849A1 Monoazo pigments, preparation thereof and use thereof |
| 06/20/1989 | US4841027 Process for preparing phenyl- and naphthylazo-aminonaphthol sulphonic acids |
| 06/14/1989 | EP0320447A2 Process for the preparation of metallisable azo dyes |
| 06/14/1989 | EP0320446A2 Process for the preparation of metallizable azo dyes |
| 06/07/1989 | EP0319452A2 Monoazo pigments, process to manufacture them and their use |
| 06/06/1989 | US4837308 Process for the preparation of azo compounds |
| 05/09/1989 | US4829185 Neutron and/or gamma radiation detecting system |
| 04/12/1989 | EP0136619B1 Process for the manufacture of preparations of azo dyes |
| 03/15/1989 | EP0307357A2 Process for the preparation of azo dyes capable of being metallized |
| 03/08/1989 | EP0305885A2 Esters of resin on the basis of oxyalkylates of novolak, their fabrication and use |
| 01/04/1989 | EP0297397A2 Preparation of diazo and azo compounds |
| 01/03/1989 | US4795807 Preparation of azo dyestuffs by diazotization and coupling in the presence of an ester |
| 11/09/1988 | EP0156768B1 Process for the preparation of 1:2 chromium complex dyes |
| 10/12/1988 | EP0285713A1 Direct process for the production of printing inks |
| 10/11/1988 | US4777246 1-diazo-2-naphthol-4-sulfonic acid by iron-catalyzed diazotization |
| 09/29/1988 | DE3808817A1 Verfahren zur herstellung von metallisierbaren monoazofarbstoffen Process for preparing metallizable monoazo dyes |
| 09/28/1988 | EP0284009A2 Process for the preparation of lithium salt of a reactive azo dye |
| 08/30/1988 | US4767844 Coupling diazo component having sulfonic acid group with a mixture of 2-hydroxy-3-naphthoic acid and the amide derivatives thereof |
| 07/26/1988 | US4760133 Process for preparing disazo dyes with bis-anilino methane coupling component |
| 06/28/1988 | US4754020 Acid is ion exchange resin, easy separation |
| 06/22/1988 | EP0272212A2 Process for continually producing azo or hydrazone dyes |
| 03/23/1988 | EP0260349A1 Dye diffusion transfer imaging process for production of retained images |
| 03/08/1988 | US4730037 Diazotization, azo coupling |
| 01/14/1988 | DE3623154A1 Process for the preparation of azo dye solutions |
| 11/11/1987 | EP0244687A2 Process for the manufacture of azo pigments |
| 11/11/1987 | EP0244686A2 Process for the manufacture of azo pigments |
| 10/14/1987 | EP0240902A2 Process for the manufacture of azo dyes |
| 09/09/1987 | EP0235524A2 Process for the preparation of concentrated solutions of anionic dyes |
| 05/12/1987 | US4665163 Yellow shades in plastics |
| 05/12/1987 | US4664710 Direct process for the production of printing inks |
| 04/29/1987 | EP0220130A2 Method for the determination of the concentration of diazonium ions |
| 01/21/1987 | EP0209492A2 Process to eliminate the nitrite excess in diazotization solutions |
| 11/26/1986 | EP0202906A1 Process for producing azo lake pigments |
| 11/25/1986 | US4625018 Azo pigment composition containing a laked Azo pigment and fortified latex |
| 11/20/1986 | EP0201892A1 Method of making azo compounds |
| 11/20/1986 | EP0201690A2 Process for the manufacture of aromatic diazonium salts and azo dyes |
| 10/22/1986 | EP0198800A1 Process for the production of 1-diazo-2-naphthol-4-sulphonic acid |
| 08/19/1986 | US4607096 Diazotizing aromatic amine without solubilizing groups with nitrosylsulfuric acid or nitrosyl chloride; homogeneous solutions |
| 07/16/1986 | EP0187621A2 Process for the manufacture of metallizable azo dyes |
| 06/11/1986 | EP0184555A2 Process for the diazotisation of amines |
| 05/20/1986 | CA1204737A1 Production of azo compounds |
| 04/08/1986 | CA1202960A1 Production of azo compounds |
| 12/31/1985 | CA1198730A1 Diaryl pigments, a process for their preparation and their use |
| 10/02/1985 | EP0156768A2 Process for the preparation of 1:2 chromium complex dyes |
| 08/20/1985 | US4536569 Dyeing polyesters or cellulose esters blue |
| 05/07/1985 | US4515639 Intaglio printing inks |
| 04/24/1985 | EP0077025B1 A method for preparing an azo pigment |
| 04/10/1985 | EP0136619A2 Process for the manufacture of preparations of azo dyes |
| 04/02/1985 | CA1184924A1 Anionic surface-active compounds based on oxyalkylated naphthol novolacs and their use |
| 03/05/1985 | US4502862 Cationic polyazo dyestuffs, their stable solutions, their preparation, and their use |
| 01/29/1985 | US4496481 Production of azo compounds |
| 09/18/1984 | US4472307 Preparation of anilino azo carbazole dyestuffs prepared by diazotization by nitrosylsulphuric acid in acetic acid |
| 09/04/1984 | US4469515 Production of pigments |
| 08/28/1984 | US4468349 Process for the preparation of solutions of cationic azo dyestuffs |
| 08/15/1984 | EP0115818A2 Cationic polyazo-dyestuffs, their stabilized solutions, their preparation and use |
| 08/07/1984 | CA1172250A1 Azo coupling process |
| 07/25/1984 | EP0113860A2 Preparation process of azo dyes |
| 06/12/1984 | US4454067 Continuous production of azo pigments |
| 06/12/1984 | CA1169053A1 Azo pigments |
| 03/27/1984 | US4439361 Process for controlling diazotization reactions involving nitrous reactant by testing the air above the reaction batch for its content of nitrous gases and feeding nitrous reactant in accordance with said content |
| 02/21/1984 | US4432899 Preparing concentrated azo dye solutions using nitrite salt as both coupling component and diazotizing agent |
| 02/08/1984 | EP0100043A2 Process for the manufacture of reactive azo dyestuff preparations with a low salt content |
| 01/17/1984 | CA1160430A1 Method of removing heat from exothermic chemical reactions |
| 01/11/1984 | EP0097912A1 Use of diaryl pigments for the pigmentation of plastics |
| 10/25/1983 | US4412066 Photography; medical research |
| 09/06/1983 | US4403079 Coupling; azo and disperse dyes; wetting agents; emulsifiers |
| 08/23/1983 | US4400321 Reacting a diaminobenzene, monoaminobenzene and sodium nitrite |
| 07/26/1983 | US4395264 Azo coupling process |
| 04/20/1983 | EP0077066A1 Method of preparing azo dyestuffs by diazotation and coupling |
| 04/20/1983 | EP0077025A1 A method for preparing an azo pigment |
| 03/15/1983 | US4376728 Process for the preparation of cationic alkylarylhydrazone dyestuffs and color bases thereof |
| 02/22/1983 | US4374640 Dyeing-stable modification of a disperse dyestuff, processes for its preparation and use |
| 02/22/1983 | CA1141755A1 Production of pigments |
| 01/05/1983 | EP0068186A1 Colour-stable modification of a dispersion dye, its preparation process and its use |
| 10/27/1982 | EP0063276A2 Process for the preparation of disazo compounds |
| 10/13/1982 | EP0062304A1 Process for the manufacture of azo pigment preparations, and their use |
| 08/25/1982 | EP0058384A1 Anionic surface-active compounds based on oxalkylated naphthol novolacquers, and their use |
| 08/25/1982 | EP0058296A1 Method of controlling batchwise conducted diazotization reactions |
| 08/18/1982 | EP0057880A1 Azo pigments preparations, their manufacturing process and their use |
| 08/04/1982 | EP0057020A2 Preparation of azo pigments |
| 07/28/1982 | EP0056578A2 Process for the manufacture of cationic azodye solutions |
| 07/27/1982 | US4341701 Coupling diazonium salts |
| 07/13/1982 | CA1127634A1 Process for preparing diazonium salts of 3-amino-pyrazole |
| 06/30/1982 | EP0055218A2 Manufacture of azoic compounds |
| 05/25/1982 | US4331443 Concentrated solutions of water-insoluble coupling components |
| 04/27/1982 | US4327020 Useful in electrophotographic photoconductors |
| 04/20/1982 | US4325871 Useful as photoconductors in electrography |
| 03/31/1982 | EP0048692A1 Azo coupling process |
| 03/09/1982 | US4318848 Process for the neutralization of basic reaction compositions |
| 02/24/1982 | EP0046237A1 Process for the manufacture of solutions of cationic azo dyestuffs |
| 02/17/1982 | EP0045840A1 Method to prepare solutions of cationic polyazo dyestuffs |
| 02/02/1982 | US4313872 Azo coupling in two-phase water-alcohol mixtures |
| 12/30/1981 | EP0042556A2 Process for the manufacture of alkylhydrazone cationic dyes and their dyestuff bases |
| 12/09/1981 | EP0041474A1 N-phenylphosphoramidate esters, process for their preparation and their use as coupling components |
| 09/30/1981 | EP0036553A1 Method of preparing liquid compositions of basic azo dyestuffs |
| 09/23/1981 | EP0036116A2 Method of preparing azo dyestuffs |
| 09/02/1981 | EP0034836A1 Process for preparing nitroazo benzenes |