Patents by Inventor Wolfgang Muller-Bardorff

Wolfgang Muller-Bardorff 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 Lippmann emulsions
    Patent number: 4202695
    Abstract: Fine-grain silver halide emulsions of the Lippmann-type are described which comprise derivatives of heterocyclic mercaptans corresponding to the formulae: ##STR1## wherein: each of Z.sub.1 and Z.sub.2 represents the atoms necessary to complete a 5- or 6-membered heterocyclic ring system,n is 0 or 1,X is --CO-- or --CS--,R is an alkyl group or an aryl group, andY is --CO--, --COO--, --CS--, --SO.sub.2 --, --CON(R.sub.1)-- or --CSN(R.sub.1)--, R.sub.1 being hydrogen, alkyl or aryl.Both in reversal and negative processing sharpness of fine detail is improved and the distortion of image-details is reduced. Upon reversal processing yellow staining is also reduced.
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: May 13, 1980
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Herman A. Philippaerts, Robert J. Pollet, Wolfgang Muller-Bardorff, Wilhelm Saleck, Anita von Konig, Walter Gauss, Franz Moll, Theofiel H. Ghys
  • Process for the improvement of the adhesion of photographic layers to a film web by means of a corona treatment
    Patent number: 4055685
    Abstract: Corona treatment involves the continuous subjection of the film web to a steady alternating current discharge. This treatment is carried out in two consecutive stages, the corona discharge frequency f.sub.1 in the first stage being in the range f.sub.1 = 5 to 100 kHz and the corona discharge frequency f.sub.2 in the second stage being in the range f.sub.2 = 500 to 2000 kHz.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: October 25, 1977
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Gunther Bayer, Hans Georg Fitzky, Herbert Hoyer, Gunter Luttgens, Wolfgang Muller-Bardorff