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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Lenoir; John
Address:
Marly-le-Petit, CH
No. of patents:
3
Patents:












Patent Number Title Of Patent Date Issued
4118232 Photographic material containing sulphonic acid group containing disazo dyestuffs October 3, 1978
The invention is directed essentially to photographic material containing, on a carrier, a layer with azo dyestuffs of the formula ##STR1## wherein A, B, X and Y are certain substituents, in a second main aspect azo dyestuffs of the formula ##STR2## wherein B' represents cert
4051123 Sulfonic-acid-group containing disazo dyestuffs September 27, 1977
In a first main aspect azo dyestuffs of the formula ##STR1## wherein A, B, X and Y are certain substituents, in a second main aspect azo dyestuffs of the formula ##STR2## wherein B' represents certain substituents and in a third main aspect azo dyestuffs of the formulawherein
3931142 Heterocyclic containing disazo compounds January 6, 1976
Polyazo dyestuffs of the formulawherein A and A' each represents a 2(8)-amino-8(2)-hydroxynaphthalene radical further substituted with a sulphonic acid group, M and M' each represents a substituted 1,4- or 1,3-phenylene radical and D represents an organic radical bonded in the manner of










 
 
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