Patents by Inventor Marcel Mestdagh

Marcel Mestdagh 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).

  • Patent number: 5595864
    Abstract: A photographic material has been coated on at least one side of a support with in at least one photosensitive layer hexagonal and/or circular tabular silver halide emulsion crystals occupying at least 70% of the total projected area of all grains, having a thickness of 0.15 to 0.30 .mu.m, a coefficient of variation of the tabular grains between 0.15 and 0.45 and an average aspect ratio of at least 2:1, prepared in the absence of ammonia by growing the nuclei, prepared at a pBr value between 1.0 and 2.0 and consuming less than 10% by weight of silver nitrate, during a first growth step at a pBr value between 1.0 and 2.5 consuming at least 10% by weight of silver nitrate and during a second growth step at a pBr value higher than 2.7 during the addition of at least 40% of the total amount of silver nitrate used.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: January 21, 1997
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Marc Van den Zegel, Marcel Mestdagh