Patents by Inventor Luigi Valbusa

Luigi Valbusa 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).

  • 5-(1,2,4)-triazolyl-S-triazines
    Patent number: 4988811
    Abstract: Direct positive photographic elements are disclosed employing internal latent image silver halide emulsions associated with developer autoxidation promoter agents constituted by 5 or 6 membered nucleus-containing heterocyclic compounds comprising an azomethine group, whose methine group is substituted with a 5-amino-1,2,4-triazolyl group, and/or copper complex compounds thereof.Preferably said direct positive photographic elements are multi-layer elements comprising internal latent image type type silver halide emulsion layers sensitized to different regions of the visible light and associated with image-dye providing compounds (photographic color couplers).
    Type: Grant
    Filed: October 10, 1986
    Date of Patent: January 29, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Luigi Valbusa, Enzo Coraluppi, Andrea Quaglia, Mario Tavella
  • Process for forming direct positive images, direct positive silver halide elements, compositions and compounds as characteristics feature of such processes and elements
    Patent number: 4636457
    Abstract: Direct positive photographic elements are disclosed employing internal latent image silver halide emulsions associated with developer autoxidation promoter agents constituted by 5 or 6 membered nucleus-containing heterocyclic compounds comprising an azomethine group, whose methine group is substituted with a 5-amino-1,2,4-triazolyl group, and/or copper complex compounds thereof.Preferably said direct positive photographic elements are multi-layer elements comprising internal latent image type type silver halide emulsion layers sensitized to different regions of the visible light and associated with image-dye providing compounds (photographic color couplers).
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: January 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Luigi Valbusa, Enzo Coraluppi, Andrea Quaglia, Mario Tavella
  • Fogged direct positive silver halide emulsion containing a cyanine dye having at least one benzoxazole or benzothiazole nucleus substituted with halogen atoms
    Patent number: 4110116
    Abstract: New cyanine dyes derived from di-halogen-benzoxazoles and benzothiazoles are desensitizers for silver halide negative emulsions and useful electron acceptor spectral sensitizers for direct positive silver halide emulsions.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: August 29, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Paolo Beretta, Luigi Valbusa
  • Fogged direct-positive silver halide emulsion containing a cyanine dye having an indole or indolenine nucleus substituted with a benzoyl or a phenylsulfonyl group
    Patent number: 4025347
    Abstract: New cyanine dyes, comprising at least one of the following nuclei (or derivatives thereof):1. 2,3,3-trimethyl-5-phenyl-sulfonyl-indolenine;2. 2,3,3-trimethyl-5-benzoyl-indolenine;3. 1-aryl or alkyl-2-phenyl-5-phenyl-sulfonyl-indole;4. 1-aryl or alkyl-2-phenyl-5-benzoyl-indole,Are desensitizers for silver halide negative emulsions and useful electron acceptor spectral sensitizers for direct positive silver halide emulsions.
    Type: Grant
    Filed: June 12, 1974
    Date of Patent: May 24, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Paolo Beretta, Luigi Valbusa