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Bergthaller; Peter
Cologne, DT
No. of patents:

Patent Number Title Of Patent Date Issued
4067741 Hardening photographic layers containing silver halide with a 1-sulphonyl-4-amino-pyridinium sal January 10, 1978
1-Sulphonyl-4-amino-pyridinium salts are used as quick acting hardeners for protein-containing layers, in particular gelatine layers, for photographic purposes.
4055427 Process of hardening a silver halide photographic material with a 1-carbamoyloxypyridinium salt October 25, 1977
As quick-acting hardeners for layers which contain protein, in particular gelatin layers for photographic purposes carbamoyl oxypyridinium salts are used.
4013468 Method of hardening a protein-containing layer of a silver halide photographic material with an March 22, 1977
A process for hardening protein-containing, preferably gelatin-containing, photographic layers wherein as hardeners unsubstituted or substituted esters of 2-substituted, 1,2-dihydroquinoline-N-carboxylic acids and/or unsubstituted or substituted esters of 1-substituted 1,2-dihydroiso

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