Patents by Inventor Wilson Tam

Wilson Tam 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).

  • Hydrocyanation process and multidentate phosphite and nickel catalyst composition therefor
    Patent number: 5663369
    Abstract: A catalyst composition comprising a zero-valent nickel and a multidentate phosphite ligand in the presence of a Lewis acid promoter.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: September 2, 1997
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Kristina Ann Kreutzer, Wilson Tam
  • NLO dye compositions and use thereof in producing NLO elements
    Patent number: 5622654
    Abstract: Nonlinear optical elements are disclosed which comprise a polyimide which is solution and/or melt processible, and a poled NLO dye. Also disclosed is a process for making such elements, and devices in which they can be used.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: April 22, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John D. Summers, Wilson Tam
  • Monodentate phosphite and nickel catalyst composition for monoolefin hydrocyanation
    Patent number: 5543536
    Abstract: Catalyst compositions comprising zero-valent nickel and a mondentate phosphite ligand are provided, with a process for the hydrocyanation of monoolefins using these compositions in the presence of a Lewis acid promoter.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: August 6, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilson Tam
  • NLO dye compositions and use thereof in producing NLO elements
    Patent number: 5534201
    Abstract: Nonlinear optical elements are disclosed which comprise a polyimide which is solution and/or melt processible, and a poled NLO dye. Also disclosed is a process for making such elements, and devices in which they can be used.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: July 9, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John D. Summers, Wilson Tam
  • Hydrocyanation process and multidentate phosphite and nickel catalyst composition therefor
    Patent number: 5512696
    Abstract: A process for hydrocyanation of an aliphatic monoethylenically unsaturated compound, in which the ethylenic double bond is not conjugated to any other unsaturated group in the molecule, or a monoethylenically unsaturated compound in which the ethylenic double bond is conjugated to an ester group, which process uses a catalyst composition comprising a zero-valent and a multidentate phosphite ligand in the presence of a Lewis acid promoter.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: April 30, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kristina A. Kreutzer, Wilson Tam
  • Bidentate phosphite and nickel catalyst compositions for hydrocyanation of monoolefins
    Patent number: 5512695
    Abstract: Processes for hydrocyanation of nonconjugated aliphatic monoolefins or monoolefins conjugated to an ester group utilizing a catalyst precursor composition comprising an unsymmetrical bidentate phosphite ligand and zero-valent nickel, preferably in the presence of a Lewis acid promoter, to produce a terminal organonitrile. Catalyst precursor compositions are also disclosed.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: April 30, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kristina A. Kreutzer, Wilson Tam
  • Fluorinated sulfones/ketones for nonlinear optics
    Patent number: 5312930
    Abstract: This invention relates to optical elements capable of second harmonic generation and novel compositions for use in such optical elements comprising polar molecules placed in noncentrosymmetric configuration wherein such optical element has an electron donor moiety linked through a conjugated bonding moiety to an electron acceptor moiety which consists of a selected fluorinated sulfone, fluorinated ketone, fluorinated vinyl sulfone or fluorinated alkyl vinyl sulfone.
    Type: Grant
    Filed: December 31, 1992
    Date of Patent: May 17, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Lap T. Cheng, Andrew E. Feiring, Wilson Tam
  • Nonlinear optical materials
    Patent number: 5312565
    Abstract: Novel organic glass compositions are disclosed which are poled to achieve nonlinear optical properties. Novel compounds useful for making said poled compositions are also disclosed; as are a method and a device for transforming electromagnetic radiation using a nonlinear optical element formed from said compositions; and certain intermediates for making novel compounds.
    Type: Grant
    Filed: May 8, 1991
    Date of Patent: May 17, 1994
    Assignee: E. I. duPont de Nemours and Company
    Inventors: Richard Beckerbauer, Dennis S. Donald, Wilson Tam, Frederick C. Zumsteg, Jr.
  • Polymeric films for second order nonlinear optics
    Patent number: 5294493
    Abstract: Films of a multiplicity of adjacent polymeric, amphiphilic monolayers, said film having second order optical nonlinearity which increases with the number of active monolayers are provided, as well as novel polymers from which said films are prepared.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: March 15, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard Beckerbauer, Hui Hsiung, Mureo Kaku, Jose M. Rodriguez Parada, Wilson Tam
  • Polymeric compositions for nonlinear optics
    Patent number: 5272218
    Abstract: Disclosed are polymers which contain NLO dye moieties based upon a barbituric acid group, a thiobarbituric acid group or a 1,3-bis(dicyanomethylene)indan-2-ylidene group. These polymers, after poling, are useful in NLO elements in devices employing nonlinear optics. Also disclosed are various intermediates used in making such polymers.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: December 21, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Lap-Tak A. Cheng, Wilson Tam
  • Crosslinked poled polymers for nonlinear optic applications and method of making them
    Patent number: 5266651
    Abstract: Polymer reagents containing reactive functional groups are crosslinked by reacting them with compounds (crosslinking agents) which contain complimentary functional groups and have large nonlinear polarizability. The resulting polymer reagents, after poling, are useful for nonlinear optic applications. Also disclosed are the mixture which react to form the crosslinked polymer and novel crosslinking agents.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: November 30, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert P. Foss, Wilson Tam, Fredrick C. Zumsteg, Jr.
  • Fluorinated sulfones/ketones for nonlinear optics
    Patent number: 5120876
    Abstract: This invention relates to optical elements capable of second harmonic generation and novel compositions for use in such optical elements comprising polar molecules placed in noncentrosymmetric configuration wherein such optical element has an electron donor moiety linked through a conjugated bonding moiety to an electron acceptor moiety which consists of a selected fluorinated sulfone, fluorinated ketone, fluorinated vinyl sulfone or fluorinated alkyl vinyl sulfone.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: June 9, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Lap T. Cheng, Andrew E. Feiring, Wilson Tam
  • Nonlinear optical device from 3-methyl-4-methoxy-4'-nitrostilbene
    Patent number: 4985178
    Abstract: A nonlinear optical element comprising 3-methyl-4-methoxy-4'-nitrostilbene useful for nonlinear optical and electro-optic effects.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wilson Tam
  • Nonlinear optical devices from derivatives of stilbene and diphenylacetylene
    Patent number: 4966730
    Abstract: Certain derivatives of stilbene and diphenylacetylene are capable of second harmonic generation when illuminated by coherent optical radiation.
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: October 30, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert A. Clement, Wilson Tam, Ying Wang
  • Optical nonlinearity in organic and organometallic molecules via lattice inclusion complexation
    Patent number: 4962979
    Abstract: There are disclosed a nonlinear optical element capable of second harmonic generation comprising a crystalline inclusion complex of a lattice-forming host compound crystallized with continuous channel cavities in the presence of a nonlinearly polarizable guest compound in a noncentrosymmetric space group, said guest compound having specified properties, and both said guest and host being selected from specified classes; a nonlinear optical device; a method of generating second harmonic radiation; and an electro-optic modulator.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: October 16, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert G. Anderson, David F. Eaton, Wilson Tam, Ying Wang
  • Nonlinear optical devices from derivatives of stilbene
    Patent number: 4961631
    Abstract: Certain derivatives of stilbene are capable of second harmonic generation when illuminated by coherent optical radiation.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: October 9, 1990
    Assignee: E. I Du Pont de Nemours and Company
    Inventors: Robert A. Clement, Wilson Tam, Ying Wang
  • Nonlinear optical devices from derivatives of stilbene and diphenylacetylene
    Patent number: 4909964
    Abstract: Certain derivatives of stilbene and diphenylacetylene capable of second harmonic generation when illuminated by coherent optical radiation are presented.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: March 20, 1990
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Robert A. Clement, Wilson Tam, Ying Wang
  • Optical nonlinearity in organic and organometallic molecules via lattice inclusion complexation
    Patent number: 4818898
    Abstract: There are disclosed a nonlinear optical element capable of second harmonic generation comprising a crystalline inclusion complex of a lattice-forming host compound crystallized with continuous channel cavities in the presence of a nonlinearly polarizable guest compound in a noncentrosymmetric space group, said guest compound having specified properties, and both said guest and host being selected from specified classes; a nonlinear optical device; a method of generating second harmonic radiation; and an electro-optic modulator.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: April 4, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert G. Anderson, David F. Eaton, Wilson Tam, Ying Wang
  • Monoorganylation of dihaloaromatics
    Patent number: 4538003
    Abstract: Process for the monoalkylation/monoarylation of dihaloaromatic compounds by treating the latter with selected magnesium or zinc organometallic reagents in the presence of a nickel/bidentate or tridentate phosphorus ligand. The products are intermediates to agricultural and pharmaceutical compounds.
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: August 27, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilson Tam
  • Method for the hydrocarbylation of naphthoquinone derivatives
    Patent number: 4507241
    Abstract: A method for the hydrocarbylation of naphthoquinones comprising cross-coupling addition of the hydrocarbyl moiety of selected organometallic reagents to leaving group-substituted naphthoquinones.
    Type: Grant
    Filed: March 7, 1983
    Date of Patent: March 26, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George W. Parshall, Wilson Tam