Patents by Inventor Walther Wolf

Walther Wolf 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).

  • Heterocyclic compounds and porphyrin compounds obtainable therefrom
    Patent number: 5162518
    Abstract: Porphyrins of the formula ##STR1## in which the substituents have the meaning given in the description are obtained by heating compounds of the formula ##STR2## if appropriate in the presence of compounds of the formula ##STR3## The porphyrins are used as pigments.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: November 10, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Kaletta, Meinhard Rolf, Walther Wolf, David R. Terrell
  • Light-sensitive material containing emulsified substances
    Patent number: 4106940
    Abstract: A light-sensitive material containing in emulsified form photographic additives and a process for introducing these photographic additives in emulsified form into photographic hydrophilic colloid layers with at least one N-alkylphtalimide derivative of the formula ##STR1## in which R.sub.1 and R.sub.2 are as defined hereinafter; the material having improved stability properties.
    Type: Grant
    Filed: October 3, 1975
    Date of Patent: August 15, 1978
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Hans Langen, Erwin Ranz, Johannes Eibl, Walther Wolf