Patents by Inventor Stephen T. Wellinghoff

Stephen T. Wellinghoff 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).

  • Patent number: 5372796
    Abstract: A method of making metal oxide clusters in a single stage by reacting a metal oxide with a substoichiometric amount of an acid in the presence of an oxide particle growth terminator and solubilizer. A method of making a ceramer is also disclosed in which the metal oxide clusters are reacted with a functionalized polymer. The resultant metal oxide clusters and ceramers are also disclosed.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: December 13, 1994
    Assignee: Southwest Research Institute
    Inventor: Stephen T. Wellinghoff
  • Patent number: 5360609
    Abstract: A process incorporating a chlorine dioxide generating compound such as sodium chlorite into a polymer or oligomer film is coated onto various substrates. Controlled release is accomplished by absorption of moisture from the environment. The chlorine dioxide so released acts as a biocide and a fumigant. The chlorite is dissolved into a hydrogen bonded phase containing a monomeric, or polymeric amide or a monomeric or polymeric alcohol. This hydrogen bonded phase is then mixed with an incompatible apolar phase consisting of anhydride containing such as polymers such as maleic anhydride copolymers with olefins, grafted maleic anhydride-polypropylene polymers. Chlorine dioxide is released by direct reaction of the anhydride or hydrolyzed anhydride with the chlorite anion across the phase boundary. Increasing the molecular weight of the phases, increasing the phase incompatibility and decreasing the concentration of anhydride will all decrease the chlorine dioxide release rate.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: November 1, 1994
    Assignee: Southwest Research Institute
    Inventor: Stephen T. Wellinghoff
  • Patent number: 5254598
    Abstract: A biodegradable composition comprising a polymer matrix having distributed substantially uniformly therethrough hollow sphere-like inclusions or microcapsules, said polymer matrix consisting essentially of a water-soluble polymer/polymer-compatible salt complex with said salt present in an amount sufficient to render said polymer insoluble in water and products made by shaping such composition.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: October 19, 1993
    Assignee: Southwest Research Institute
    Inventors: Herman W. Schlameus, Mary C. Marshall, Stephen T. Wellinghoff, Donald J. Mangold, James R. Scott
  • Patent number: 5130412
    Abstract: An electrically conducting self-doped carbazole polymer of the formula: ##STR1## wherein A is a bifunctional molecule capable of bonding to a positively charged molecule at one end and is capable of bonding to a flexible spacer group Z at another end, Z is a flexible spacer group capable of bonding to an anionic group A at one end and is capable of bonding either to a nitrogen or aromatic electron withdrawing or electron donating group at another end, E is a bifunctional molecule capable of bonding to nitrogen at one end and is capable of bonding to a flexible spacer group Z at anther end, X is a positively charged counterion, and n is at least 2.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: July 14, 1992
    Assignee: Southwest Research Institute
    Inventors: Stephen T. Wellinghoff, Charles K. Baker
  • Patent number: 4994023
    Abstract: An electrochemical drug release article containing an electrically conducting self-doped carbazole polymer of the formula: ##STR1## wherein A is a bifunctional molecule capable of bonding to a positively charged molecule at one end and is capable of bonding to a flexible spacer group Z at another end, Z is a flexible spacer group capable of bonding to an anionic group A at one end and is capable of bonding either to a nitrogen or aromatic electron withdrawing or electron donating group at another end, E is a bifunctional molecule capable of bonding to nitrogen at one end and is capable of bonding to a flexible spacer group Z at another end, X is a positively charged counterion, and n is at least 2.
    Type: Grant
    Filed: August 8, 1989
    Date of Patent: February 19, 1991
    Inventors: Stephen T. Wellinghoff, Charles K. Baker
  • Patent number: 4849140
    Abstract: Monosized ceramic particles produced through synergistic combination of monosized latex particles and organometallic reagents in a solvent system. By swelling a poly(vinyltoluene) or other monosized latex with an appropriate organometallic reagent, decomposing the organometallic to ceramic within the latex vehicle, and then removing the latex polymer through thermolysis, monosized ceramic particles are produced. The swelling of the monosized latex particles with the organometallic reagent requires the judicious selection of a solvent system specific to the latex polymer and organic being employed.
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: July 18, 1989
    Assignee: Southwest Research Institute
    Inventors: Stephen T. Wellinghoff, Stuart T. Schwab, Carlos D. Herrera
  • Patent number: 4801411
    Abstract: A method and apparatus for producing uniform, monosize ceramic particles forming the microsize particles by vapor condensation or ultrasonic cavitation. Organometallic liquids are directed to an aerosol generator where a droplet stream is projected in free flight within a reaction chamber and a particle sorter. Through the process of sorting the droplets according to their velocity in flight, monosize droplets are collected. The particles may be reacted prior to or after sorting and collection to form the monosize ceramic particle of interest. Sintering aids are introduced into the process to produce ceramic particles capable of improved green body formation.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: January 31, 1989
    Assignee: Southwest Research Institute
    Inventors: Stephen T. Wellinghoff, Thomas E. Owen
  • Patent number: 4595609
    Abstract: Substrates having free surface hydroxyl groups, such as silaceous and aluminous materials, are rendered corrosion resistant by the application thereto of an amorphous, homogeneous tantalum pentaoxide coating layer.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: June 17, 1986
    Assignee: Regents of the University of Minnesota
    Inventors: Stephen T. Wellinghoff, Ching Lin
  • Patent number: 4499008
    Abstract: A method of making an electrically conducting polymer is disclosed which includes poly(N-alkyl 3',3 carbazolyl) at least a portion of which is doped with a compatible charge transfer acceptor to provide p-type electrical conductivity, and in which the alkyl group is one selected from the group consisting of ethyl and methyl or a combination thereof.
    Type: Grant
    Filed: December 9, 1983
    Date of Patent: February 12, 1985
    Assignee: Honeywell Inc.
    Inventors: Stephen T. Wellinghoff, Samson A. Jenekhe, Thomas J. Kedrowski
  • Patent number: 4452725
    Abstract: An electrically conducting polymer is disclosed which includes poly(N-alkyl 3',3 carbazolyl) at least a portion of which is doped with a compatible charge transfer acceptor to provide p-type electrical conductivity, and in which the alkyl group is one selected from the group consisting of ethyl and methyl or a combination thereof.
    Type: Grant
    Filed: September 21, 1982
    Date of Patent: June 5, 1984
    Assignee: Honeywell Inc.
    Inventors: Stephen T. Wellinghoff, Samson A. Jenekhe, Thomas J. Kedrowski