Patents by Inventor Hugh S. Laver

Hugh S. Laver 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).

  • Ink compositions
    Patent number: 5509957
    Abstract: The invention relates to ink compositions, in particular for ink-jet printing, containing as stabiliser a water-soluble compound of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, L, M and n are as defined in claim 1, to said compounds and to recording materials containing them, and to a process for stabilising ink-jet prints, the stabiliser being a compound of formula (I) or (II).
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: April 23, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Vien V. Toan, Hugh S. Laver, David G. Leppard
  • Color-photographic recording material
    Patent number: 5411847
    Abstract: A color-photographic recording material is described which contains a magenta coupler and, as stabilizer, at least one compound of the formula ##STR1## where the radicals are as defined in claim 1.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: May 2, 1995
    Assignee: Ciba-Geigy Corporation
    Inventors: David G. Leppard, Hugh S. Laver
  • Pressure-sensitive or heat-sensitive recording material
    Patent number: 5318939
    Abstract: Compounds of formula ##STR1## wherein R, L, X and Y are as defined in claim 1, are very suitable for use as UV absorbers in pressure-sensitive or heat-sensitive recording materials.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: June 7, 1994
    Assignee: Ciba-Geigy Corporation
    Inventors: Hugh S. Laver, Mario Slongo
  • Inks
    Patent number: 5261953
    Abstract: Inks, in particular for ink-jet printing, containing, as stabilizer, a water-soluble compound of the formula ##STR1## in which R.sub.1 to R.sub.7 are as defined in claim 1, and recording materials containing these compounds.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: November 16, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Eric Vieira, David G. Leppard, Hugh S. Laver, Vien V. Toan
  • Light-stabilized ink composition
    Patent number: 5124723
    Abstract: 2-(2'-Hydroxyphenyl)benzotriazoles of formula I ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in claim 1, and which contain at least one --SO.sub.3 X group in the molecule, are suitable light stabilizing additives for aqueous ink compositions, especially for ink jet printing. Some of these compounds are novel compounds.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: June 23, 1992
    Assignee: Ciba-Geigy Corporation
    Inventor: Hugh S. Laver
  • Inks, particularly for ink printing
    Patent number: 5098477
    Abstract: Inks, particularly inks for ink jet printing, contain at least one compound of the formula I ##STR1## as a stabilizer. The symbols R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.3 ' and R.sub.4 ' are as defined in claim 1. The compounds are in part novel and are suitable for use as light stabilizers for organic materials.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: March 24, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Eric Vieira, Hugh S. Laver
  • Light-stabilized ink compositions
    Patent number: 5096489
    Abstract: 2-Hydroxyphenyl-s-triazines of formula I ##STR1## wherein X, Y, R.sub.1, R.sub.2 and R.sub.3 are as defined in claim 1 and at least one of the substituents R.sub.1 and R.sub.2 is a water-solubilizing group, are suitable light stabilizing additives for aqueous ink compositions, preferably for ink jet printing and appropriate recording materials.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: March 17, 1992
    Assignee: Ciba-Geigy Corporation
    Inventor: Hugh S. Laver
  • Water-soluble compounds as light stabilizers
    Patent number: 5096781
    Abstract: Compounds of the formula IU--SOL).sub.n ' (I)in which n' is a number from 1 to 4, U is a radical of a UV absorber of the hydroxyphenylbenzotriazole, hydroxybenzophenone, cinnamic acid or triazine type and SOL is a group of the formula Ia ##STR1## The symbols in the formula Ia are as defined in claim 1. The compounds, which are in part novel, are suitable for use as light stabilizers, particularly for recording materials and inks for ink jet printing.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: March 17, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Eric Vieira, Hugh S. Laver
  • Inks containing a water soluble compound as a stabilizer particularly for ink jet printing
    Patent number: 5089050
    Abstract: Inks, in particular for ink-jet printing, containing, as stabilizer, a water-soluble compound of the formula ##STR1## in which R.sub.1 to R.sub.7 are as defined in claim 1, and recording materials containing these compounds.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: February 18, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Eric Vieira, David G. Leppard, Hugh S. Laver, Vien V. Toan
  • Recording materials for ink-jet printing
    Patent number: 5073448
    Abstract: Recording materials for ink jet printing containing, as a stabilizer, at least one compound of the formula I ##STR1## The symbols R.sub.1, R.sub.2, R.sub.3, R.sub.3 'R.sub.4 and R.sub.4 ' are as defined in claim 1.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: December 17, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Eric Vieira, Hugh S. Laver