Patents by Inventor Kumaran M. Nair

Kumaran M. Nair 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).

  • Glass ceramic dielectric compositions
    Patent number: 4948759
    Abstract: The invention is directed to thick film glass ceramic dielectric compositions in which the dielectric is a mixture of amorphous aluminoborosilicate glass, which upon firing forms a single phase of ceramic crystals in a matrix of amorphous remainder glass, and a ceramic additive to minimize substrate bowing.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: August 14, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Glass ceramic dielectric compositions
    Patent number: 4820661
    Abstract: The invention is directed to thick film crossover dielectric compositions in which the dielectric is an amorphous aluminoborosilicate glass which upon firing forms a single phase of celsian in a matrix of amorphous remainder glass.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: April 11, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Resistor compositions
    Patent number: 4657699
    Abstract: The invention is directed to a thick film resistor composition for firing in a low oxygen-containing atmosphere comprising finely divided particles of (a) a semiconductive material consisting essentially of a refractory metal carbide, oxycarbide or mixtures thereof and (b) a nonreducing glass having a softening point below that of the semiconductive material dispersed in (c) organic medium and to resistor elements made therefrom.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: April 14, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Resistor compositions
    Patent number: 4652397
    Abstract: The invention is directed to a thick film resistor composition for firing in a low oxygen-containing atmosphere comprising finely divided particles of (a) semiconductive material consisting essentially of a cationic excess solid solution and (b) a nonreducing glass having a softening point below that of the semiconductive material dispersed in (c) organic medium and to resistor elements made therefrom.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: March 24, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Resistor compositions
    Patent number: 4645621
    Abstract: The invention is directed to a thick film resistor composition for firing in a low oxygen-containing atmosphere comprising finely divided particles of (a) an anion-deficient semiconductive material consisting essentially of a refractory metal nitride, oxynitride or mixture thereof and (b) a nonreducing glass having a softening point below that of the semiconductive material dispersed in (c) organic medium and to resistor elements made therefrom.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: February 24, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Method for activating metal particles
    Patent number: 4477296
    Abstract: A method for activating the surface of finely divided particles of conductive metals having a thin surface coating of an oxide of the conductive metal comprising the steps of (a) treating the surface with an aqueous solution of a reducing agent when the conductive metal is a noble metal and either a reducing agent for the oxide or an inorganic acid when the conductive metal is a base metal, (b) washing the surface of the treated particles with an aqueous liquid, and (c) drying the surface of the washed particles.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: October 16, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Method for making capacitors with noble metal electrodes
    Patent number: 4426356
    Abstract: A process for making capacitors using electrode compositions of finely divided particles of noble metals and certain inorganic metal oxides dispersed in an inert organic medium. Suitable inorganic metal oxides are MoO.sub.3, GeO.sub.2, Pb.sub.5 Ge.sub.3 O.sub.11, Nb.sub.2 O.sub.5, NiO, ZnO, SnO.sub.2, CdO, metal phosphates, metal fluorides, phosphate glasses, germanate glasses, fluoride glasses and mixtures and precursors thereof.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: January 17, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Thick film conductor compositions
    Patent number: 4416932
    Abstract: A ceramic substrate having a conductive pattern coating thereon wherein the coating comprises an admixture of finely divided particles of a noble metal or alloy, a low melting low viscosity glass, a spinel-forming metal oxide and an organo titantate and the process of making same.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Thick film conductor compositions
    Patent number: 4394171
    Abstract: Metallization suitable for making printed thick film terminations comprising an admixture of finely divided particles of palladium/silver as the conductive phase and bismuth-free low-melting, low viscosity devitrifiable glass as the binder phase. The composition optionally contains a spinel-forming metal oxide to raise substrate adhesion.
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: July 19, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Screen-printable dielectric composition
    Patent number: 4392180
    Abstract: Thick film dielectric compositions suitable for screen-printing comprising a substituted perovskite, an inorganic dopant, and a low temperature-devitrifiable frit or glass. Upon firing the dielectric composition is highly hermetic.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: July 5, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Thick film conductor compositions
    Patent number: 4381945
    Abstract: Thick film conductor metallization comprising an admixture of finely divided particles of noble metal or alloy, low-melting, low viscosity glass, a spinel-forming metal oxide and an organo titanate.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: May 3, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair
  • Screen-printable dielectric composition
    Patent number: 4377840
    Abstract: Thick film dielectric compositions suitable for screen-printing comprising a perovskite, a bismuth-substituted pyrochlore, and a low temperature melting-devitrifiable glass. Upon firing the dielectric composition is highly hermetic.
    Type: Grant
    Filed: March 24, 1982
    Date of Patent: March 22, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kumaran M. Nair