Patents by Inventor Quirin Scheben

Quirin Scheben 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).

  • Process for the production of 2-equivalent yellow couplers
    Patent number: 4230851
    Abstract: .alpha.-Acylacetamide 2-equivalent yellow couplers may be prepared by reacting .alpha.-halo-.alpha.-acyl-acetamides with phenols or NH-acidic organic compounds in the presence of a non-alkylatable bicyclic nitrogen-containing base, such as 1,5-diazabicyclo[4,3,0]non-5-ene or 1,8-diazabicyclo[5,4,0]-undec-7-ene.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: October 28, 1980
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Gunter Renner, Quirin Scheben
  • Aliphatic .beta.-keto esters
    Patent number: 4031130
    Abstract: A process for the production of aliphatic .beta.-keto esters by reacting a dialkyl ketone with a dialkylcarbonate in the presence of an at least equivalent quantity of a basic condensation agent based on the dialkyl ketone at a reaction temperature of 20.degree. to 80.degree. C and the reaction product is subsequently converted by acidification into the .beta.-keto ester. By carrying out the condensation reaction in the presence of hexamethylphosphoric acid triamide as solvent advantageously higher yields of 20 to 50 % can be obtained by the inventive process of compared to conventional processes.
    Type: Grant
    Filed: March 11, 1975
    Date of Patent: June 21, 1977
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Gunter Renner, Immo Boie, Quirin Scheben