Patents by Inventor Laszlo A. Meszaros

Laszlo A. Meszaros 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).

  • Sulfur dye compositions and their production
    Patent number: 5470356
    Abstract: A sulfur dye or sulfurized vat dye is treated in an aqueous reducing medium, preferably an aqueous mixture of alkali and reducing sugar, to form a solution which is then oxidized to form particles of the dye having improved characteristics.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: November 28, 1995
    Inventor: Laszlo A. Meszaros
  • Dyeing method
    Patent number: 5030248
    Abstract: Cellulosic substrates are dyed by a continuous dyeing method with dispersed sulfur dyes using a reducing sugar, especially glucose, as the reducing agent for the dye.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: July 9, 1991
    Assignee: Sandoz Ltd.
    Inventor: Laszlo A. Meszaros
  • Sulfur dyes and method of preparing same: membrane process
    Patent number: 4992078
    Abstract: Improved sulfur dye dispersions are obtained by subjecting an aqueous suspension of oxidized sulfur dye particles to membrane separation. The oxidized sulfur dye is obtained by controlled aeration whereby the content of sulfides, polysulfur and inorganic salts is significantly decreased.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: February 12, 1991
    Assignee: Sandoz Ltd.
    Inventor: Laszlo A. Meszaros
  • Liquid compositions of prereduced sulfur dyes and production thereof
    Patent number: 4917706
    Abstract: Liquid compositions of sulfur dyes in reduced form are obtained by reducing a sulfur dye in an alkaline medium to which no sulfide reducing agent has been added, preferably employing a reducing sugar as reducing agent and a sulfur dye which has been washed to remove inorganic salts therefrom.
    Type: Grant
    Filed: February 1, 1988
    Date of Patent: April 17, 1990
    Assignee: Sandoz Ltd.
    Inventor: Laszlo A. Meszaros
  • One-bath dyeing of polyester-cellulosic blends using disperse and sulfur dyes
    Patent number: 4801303
    Abstract: Polyester-cotton blend textile substrates are dyed with a disperse dye and then with a sulfur dye from the same dyebath which is maintained at a temperature no higher than 105.degree. C. when the sulfur dye is present therein and which preferably contains glucose as the reducing agent for the sulfur dye.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: January 31, 1989
    Assignee: Sandoz Ltd.
    Inventors: Mark S. Carlough, Laszlo A. Meszaros
  • Dyed polyethylene terephthalate textile fibers with greenish blue shade
    Patent number: 4076498
    Abstract: Polyethylene textile fibers dyed with the dyestuff resulting from coupling equimolar amounts of diazotized ##STR1## and the coupling components obtained by reacting 3-amino-4-methoxyacetanilide or 3-amino-4-ethoxyacetanilide with diethyl sulfate, wherein X is Cl or Br are disclosed. Said fibers are a desirable greenish blue shade, with good fastness properties, and a very green flare under incandescent light.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: February 28, 1978
    Assignee: Martin Marietta Corporation
    Inventor: Laszlo A. Meszaros