A collar for protecting the iron spade of an anode rod for a carbon block that serves as an anode in the electrolytic production of aluminum comprises a plurality of shaped carbon blocks each with two close-fitting, abutting end faces and recesses which jointly correspond in cross-section to that of the anode spade or pin and surround the anode spade or pin projecting out of the anode block; the b...

for the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE 1. A process for the preparation of compounds of the formula I see diagramm : EP0195277,P15,F1 in which Kat represents one molar equivalent of a cation, R is an organic radical which carrier no further phosphorylatable hydrogen atoms, X represents oxygen, sulfur or selenium, Z represents oxygen, sulfur or -NH- and n denotes at...

for the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE 1. A process for the preparation of compounds of the formula I see diagramm : EP0195277,P15,F1 in which Kat represents one molar equivalent of a cation, R is an organic radical which carrier no further phosphorylatable hydrogen atoms, X represents oxygen, sulfur or selenium, Z represents oxygen, sulfur or -NH- and n denotes at...