Abstract: Disclosed herein is a selective method for the preparation of single positional isomers of monosulphonated metallo derivatives of compounds selected from the group consisting of monosulphophthalocyanines, monosulphonaphthobenzoporphyrazines and monosulphotetraphenylporphyrins.

Abstract: A steam reforming catalyst including Ni.Cr/MgO.La.sub.2 O.sub.3.Al.sub.2 O.sub.3 is disclosed. Also disclosed is a method of preparing the catalyst. The catalyst is particularly useful for the catalytic reforming of paraffinic or polycyclic hydrocarbons by steam injection or similar methods. The catalyst has an improved useful life span, improved thermal and mechanical stability, a reduction of carbon deposits (coke) on the catalyst surface during its use, and may be readily regenerated once it is spent.

Abstract: A method and process of screening multilayer thick-film structures to produce complex hybrid electronic circuits. After deposition, drying and firing of the first conductor plane on the substrate, registration ink is deposited and allowed to dry thus forming temporary vias. A suitable dielectric paste is then deposited either on all the surface or except on viaslocations. The dielectric paste is then dried and fired. Firing however causes sublimation or evaporation of the temporary vias pattern leaving cavities in the dielectric layer. Slight buffing may be required to uncover the via holes. The vias and the second conductor plane are then deposited, dried and fired. The same steps are carried out for each subsequent conductor plane.