Patents by Inventor Arthur H. De Cat

Arthur H. De Cat has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photographic elements in which gelatin silver halide layers contain polymers with semicarbazone or alkoxy carbonyl hydrazone groups
    Patent number: 4215196
    Abstract: Abrasion marks by dry-friction and the tendency of producing pressure-scratches in photographic materials is reduced by incorporating in the gelatin silver halide emulsion layers polymeric compounds containing recurring units with semicarbazone or alkoxy carbonyl hydrazone groups in the side-chains. These recurring units are represented by one of the formulae: ##STR1## wherein: A is a single bond or --CONH-alkylene-, --COO-alkylene-, or phenylene,B is a single bond or alkylene,R.sup.1 is hydrogen or methyl,R.sup.2 is hydrogen, phenyl or lower alkyl (1-4 C),R.sup.3 is --NH--COOR or ##STR2## wherein R is lower alkyl (1-4 C) and each of R.sup.4, R.sup.5 and R.sup.6 is hydrogen or lower alkyl (1-4 C).
    Type: Grant
    Filed: June 14, 1977
    Date of Patent: July 29, 1980
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Walter F. De Winter, Daniel M. Timmerman, Arthur H. De Cat, Godfried A. Kockelbergh