公开(公告)号：DE1572267A1

公开(公告)日：1971-01-07

申请号：DEV0033500

申请日：1967-04-24

Applicant: FOTOCHEM WERKE BERLIN VEB

Inventor： WELZEL DIPL-CHEM DR HELMUT ,  JUERGENS MANFRED ,  WARNCKE HELGA ,  HARTUNG GUENTER

IPC: G03C1/04

公开(公告)号：FR1440537A

公开(公告)日：1966-05-27

申请号：FR25305

申请日：1965-07-20

Applicant: FOTOCHEM WERKE BERLIN VEB

Inventor： JUERGENS MANFRED ,  WELZEL HELMUT ,  HARTUNG GUENTER

IPC: G03C1/04

公开(公告)号：FR1474110A

公开(公告)日：1967-03-24

申请号：FR48668

申请日：1966-02-07

Applicant: FOTOCHEM WERKE BERLIN VEB

Inventor： JUERGENS MANFRED ,  WELZEL HELMUT ,  WARNCKE HELGA ,  HARTUNG GUENTER

IPC: G03C1/015

公开(公告)号：DE1572253A1

公开(公告)日：1970-02-19

申请号：DE1572253

申请日：1965-11-23

Applicant: FOTOCHEM WERKE BERLIN VEB

Inventor： JUERGENS MANFRED ,  WELZEL HELMUT DIPL-CHEM DR ,  HARTUNG GUENTER

IPC: G03C1/053

公开(公告)号：GB1064215A

公开(公告)日：1967-04-05

申请号：GB2704465

申请日：1965-06-25

Applicant: FOTOCHEM WERKE BERLIN VEB

Inventor： JUERGENS MANFRED ,  WELZEL HELMUT ,  HARTUNG GUENTER

IPC: G03C1/04

Abstract: 1,064,215. Photographic silver halide emulsions. FOTOCHEMISCHE WERKE BERLIN VEB. June 25, 1965, No. 27044/65. Heading G2C. The covering power of a photographic gelatino silver halide emulsion is increased by incorporating 5-50% by weight, based on the weight of gelatine, of a water-soluble #-sulphoalkylated polysaccharide with a degree of substitution of 0À1-1À2. The polysaccharide may be derived from dextran, starch or cellulose, may have a molecular weight of 5000-100000 and may contain alkyl, oxyalkyl, polyoxyalkyl and carboxyalkyl groups attached by ether linkages. The sulphoalkyl groups may be additionally substituted by nitrile, hydroxyl, carboxylic acid and/or further sulphonic acid groups.