Patents by Inventor Paul Tschopp

Paul Tschopp 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: 4743683
    Abstract: A photographic recording material which contains at least one dye of the formula ##STR1## wherein D is the group of atoms necessary to complete a 5-membered ring that contains at least one nitrogen atom, A is hydrogen, alkyl, alkoxy, phenyl, alkylthio, cyano, nitro or halogen, n is 0 to 3, R.sub.1 is hydrogen, alkyl, hydroxyl, acylamino, R.sub.6 is hydrogen or unsubstituted or substituted amino, and R.sub.4 is hydrogen or alkoxy. The material is distinguished by good color reproduction, brilliant colors and excellent lightfastness.
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: May 10, 1988
    Assignee: Ciba-Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4732997
    Abstract: Photographic material containing magenta coupler is stabilized by incorporating a dibenzoxaphosphorin of the formula ##STR1## into the emulsion layer containing the coupler or into an adjoining colloid layer. The yellowing on dark storage of such material is substantially reduced as a result.The symbols A and n are defined in claim 1.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: March 22, 1988
    Assignee: Ciba-Geigy AG
    Inventors: Paul Tschopp, David G. Leppard
  • Patent number: 4661437
    Abstract: A photographic recording material which contains at least one dye of the formula ##STR1## wherein D is the group of atoms necessary to complete a 5-membered ring that contains at least one nitrogen atom, A is hydrogen, alkyl, alkoxy, phenyl, alkylthio, cyano, nitro or halogen, n is 0 to 3, R.sub.1 is hydrogen, alkyl, hydroxyl, acylamino, R.sub.6 is hydrogen or unsubstituted or substituted amino, and R.sub.4 is hydrogen or alkoxy. The material is distinguished by good color reproduction, brilliant colors and excellent lightfastness.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: April 28, 1987
    Assignee: Ciba-Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4661440
    Abstract: Photographic material containing magenta coupler is stabilized by incorporating a dibenzoxaphosphorin of the formula ##STR1## into the emulsion layer containing the coupler or into an adjoining colloid layer. The yellowing on dark storage of such material is substantially reduced as a result.The symbols A and n are defined in claim 1.
    Type: Grant
    Filed: November 7, 1985
    Date of Patent: April 28, 1987
    Assignee: Ciba-Geigy AG
    Inventors: Paul Tschopp, David G. Leppard
  • Patent number: 4324898
    Abstract: Color photographic material is provided which comprises at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## in which G represents a yellow coupler radical bonded via the active methine group to the heterocyclic ring, Z represents --CO-- or --SO.sub.2 -- and M represents a substituent and A represents the non-metallic atoms necessary to complete a five-membered saturated heterocyclic ring.The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: April 13, 1982
    Assignee: Ciba Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4268592
    Abstract: Light-sensitive recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one magenta coupler of the formula ##STR1## in which A is a 5-membered, heterocyclic, unsaturated ring system which contains 2 or 3 hetero-atoms, at least one of which is a nitrogen atom, and can be fused with a benzene ring and which is substituted by at least one ballast group, R is a substituted or unsubstituted aryl radical, R.sub.1 is hydrogen, halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy and X is a radical detachable during the coupling reaction.The magenta couplers show high reactivity (high maximum density), which facilitates accelerated processing of the photographic materials, and minimal fogging. The couplers also have good fastness to light.
    Type: Grant
    Filed: August 28, 1979
    Date of Patent: May 19, 1981
    Assignee: Ciba-Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4268591
    Abstract: Light-sensitive recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1 is alkyl, R.sub.2 is alkyl or aryl and R.sub.3 is substituted or unsubstituted alkyl, alkoxy or alkylmercapto, cycloalkylmercapto, aryl, aryloxy or arylmercapto, the sum of the carbon atoms in the substituents R.sub.1, R.sub.2 and R.sub.3 being 3 to 30 and at least two of these substituents being able to form a cyclic radical together with the carbon atom to which they are bonded, the R.sub.4 s are each halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy, X is a radical detachable during the coupling reaction, A is a 5-membered, heterocyclic, unsaturated ring system which contains 2 or 3 hetero-atoms, at least one of which is a nitrogen atom, and can be fused with a benezene ring and which is substituted by at least one ballast group and r is 1 or 2.
    Type: Grant
    Filed: August 28, 1979
    Date of Patent: May 19, 1981
    Assignee: Ciba-Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4229577
    Abstract: Color photographic material is provided which contains at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## wherein G is the radical of a yellow coupler which is bonded to the heterocyclic ring by means of the active methylene group, Z is --CO-- or --SO.sub.2 --, M is hydrogen if Z is --CO--, or a substituent and R is hydrogen or a substituent.The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: October 21, 1980
    Assignee: Ciba-Geigy AG
    Inventors: Graham Evans, Mario Fryberg, Thomas Stauner, Paul Tschopp, David G. Leppard
  • Patent number: 4206278
    Abstract: Color photographic material is provided which comprises at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## in which G represents a yellow coupler radical bonded via the active methine group to the heterocyclic ring, Z represents --CO-- or --SO.sub.2 -- and M represents a substituent and A represents the non-metallic atoms necessary to complete a five-membered saturated heterocyclic ring.The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.
    Type: Grant
    Filed: April 12, 1978
    Date of Patent: June 3, 1980
    Assignee: Ciba-Geigy AG
    Inventor: Paul Tschopp
  • Patent number: 4118232
    Abstract: The invention is directed essentially to photographic material containing, on a carrier, a layer with azo dyestuffs of the formula ##STR1## wherein A, B, X and Y are certain substituents, in a second main aspect azo dyestuffs of the formula ##STR2## wherein B' represents certain substituents and in a third main aspect azo deystuffs of the formulaA.sub.1 --N.dbd.N--B.sub.1 --NH--CO--X.sub.1 --Y--Z.sub.1 --OC--HN--B.sub.1 --N.dbd.N--A.sub.1wherein A.sub.1, B.sub.1, X.sub.1, Z.sub.1 and Y are certain substituents.The photographic materials provide advantages stemming from the use of the dyestuffs of the invention which are distinguished by particularly high fastness to light coupled with excellent bleachability, good resistance to diffusion and advantageous color strength.
    Type: Grant
    Filed: March 15, 1977
    Date of Patent: October 3, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, John Lenoir, Alfred Froehlich, Thomas Stauner, Paul Tschopp
  • Patent number: 4115121
    Abstract: Color photographic material is provided which contains at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## wherein G is the radical of a yellow coupler which is bonded to the heterocyclic ring by means of the active methylene group, Z is --CO-- or --SO.sub.2 --, M is hydrogen if Z is --CO--; or a substituent and R is hydrogen or a substituent.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: September 19, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Graham Evans, Mario Fryberg, Thomas Stauner, Paul Tschopp, David G. Leppard
  • Patent number: 4051123
    Abstract: In a first main aspect azo dyestuffs of the formula ##STR1## wherein A, B, X and Y are certain substituents, in a second main aspect azo dyestuffs of the formula ##STR2## wherein B' represents certain substituents and in a third main aspect azo dyestuffs of the formulaA.sub.1 --N.dbd.N--B.sub.1 --NH--CO--X.sub.1 --Y--Z.sub.1 --OC--HN--B.sub.1 --N.dbd.N--A.sub.1wherein A.sub.1, B.sub.1, X.sub.1, Z.sub.1 and Y are certain substituents as well as the use of said azo dyestuffs in photographic material are disclosed.
    Type: Grant
    Filed: August 21, 1975
    Date of Patent: September 27, 1977
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, John Lenoir, Alfred Froehlich, Thomas Stauner, Paul Tschopp
  • Patent number: 4026709
    Abstract: The present invention relates to new compounds having an active methylene group or phenolic hydroxyl group and therefore capable of being used as photographic color couplers. The new compounds contain at least one radical of a phosphoric acid diester, phosphonic acid diester, phosphoric acid diamide, phosphonic acid diamide, phosphoric acid ester-amide or phosphonic acid ester-amide.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: May 31, 1977
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, Paul Tschopp, Thomas Stauner, Walter Heierli
  • Patent number: 3984432
    Abstract: The present invention relates to new compounds having an active methylene group or phenolic hydroxyl group and therefore capable of being used as photographic color couplers. The new compounds contain at least one radical of a phosphoric acid diester, phosphonic acid diester, phosphoric acid diamide, phosphonic acid diamide, phosphoric acid ester-amide or phosphonic acid ester-amide.
    Type: Grant
    Filed: February 27, 1974
    Date of Patent: October 5, 1976
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, Paul Tschopp, Thomas Stauner, Walter Heierli
  • Patent number: 3931142
    Abstract: Polyazo dyestuffs of the formulaA--N=N--M--D--M'--N=N--A'wherein A and A' each represents a 2(8)-amino-8(2)-hydroxynaphthalene radical further substituted with a sulphonic acid group, M and M' each represents a substituted 1,4- or 1,3-phenylene radical and D represents an organic radical bonded in the manner of an amide to M and M', said dyestuffs containing at least two sulphonic acid groups in the molecule, as well as photographic material containing in at least one layer a polyazo dyestuff of the above formula are described.
    Type: Grant
    Filed: October 23, 1973
    Date of Patent: January 6, 1976
    Assignee: Ciba-Geigy AG
    Inventors: John Lenoir, Paul Tschopp, Hansrolf Loeffel, DE Montmollin: Rene