Patents by Inventor Siegfried Schleger

Siegfried Schleger 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).

  • Color photographic recording material containing non-diffusing electron donor precursor compounds
    Patent number: 4366240
    Abstract: 5- or 6-membered .alpha.-lactones of phenolic compounds, in which the phenyl ring carries a hydroxyl or amino group in its 2- or 4-position to the lactonized phenolic hydroxyl group and in which the lactone ring carries an electron accepting substituent, so that the lactone ring is readily cleavable at pH values of from 10 to 13 to form an electron donor compound (ED-compound) having a redox potential of less than +0.255 V determined against a normal calomel electrode at pH 0 are useful ED precursor compounds for non-diffusing reducible color providing compounds.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: December 28, 1982
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Wolfgang Lassig, Ernst Meier, Siegfried Schleger
  • Process for the production of oxazolinone-2-compounds
    Patent number: 4275200
    Abstract: The condensation of an .alpha.-halogen carbonyl compound with carbamic acid esters in the presence of a basic condensing agent and an aprotic solvent enables the production of oxazolinone-2-compounds in a high degree of purity, and in high yields in one step by using simple and readily available starting compounds.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: June 23, 1981
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Fritz Benker, Hans-Heinrich Credner, Wolfgang Lassig, Ernst Meier, Siegfried Schleger
  • Light-sensitive photographic material
    Patent number: 4052213
    Abstract: Oxazolinone-2 derivatives having a releasable mercapto group in their 5-position are provided as development-inhibitor-releasing thioether compounds for use in color photographic material having a high reactivity on chromogenic development of color photographic material, and are very easy to prepare.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: October 4, 1977
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Hans Heinrich Credner, Wolfgang Lassig, Ernst Meier, Erwin Ranz, Siegfried Schleger, Karl-Wilhelm Schranz