Patents by Inventor Dirk Van Haver

Dirk Van Haver 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: 5998087
    Abstract: A silver halide photographic material is disclosed containing a new type of hydrazide compounds represented by following general formula I, the different symbols of which are defined in the description. ##STR1## In a preferred embodiment Q is chosen from pyridinium, quinolinium or isoquinolinium. In a most preferred embodiment Q is a pyridinium substituted on the N.sup.+ with a C.sub.5 to C.sub.8 alkyl group.The photographic material is preferably a graphic arts recording material. High gradation and excellent hard dot quality are obtained.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: December 7, 1999
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Johan Loccufier, Stefaan Lingier, Sabine Emmers, Jean-Marie Dewanckele, Pierre De Clercq, Noel Hosten, Dirk Van Haver
  • Patent number: 5631125
    Abstract: A photographic element is disclosed containing a compound capable of releasing image-wise a photographic useful group (PUG) based on a mechanism involving radical formation under development conditions and splitting of a homolytically labile bond. In a preferred embodiment the compound capable of releasing the PUG is a hydrazine derivative or a 1-aryl-3-pyrazolidinone derivative.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: May 20, 1997
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Jean-Marie Dewanckele, Johan Loccufier, Pierre De Clercq, Dirk Van Haver, Noel Hosten