Patents Assigned to I
  • Photopolymerization sensitizers active at longer wavelengths
    Patent number: 4987230
    Abstract: A new class of sensitizers for photopolymerizable compositions is disclosed derived from cyclic ketones and tricyclic aminoaldehydes.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Bruce M. Monroe
  • Acid catalyzed formation of carbamates from olefins
    Patent number: 4987248
    Abstract: An improved for preparing N-substituted carbamate comprising reaction of a selected olefin or alcohol with a carbamate in the presence of a catalyst comprising a blend of a perfluorinated sulfonic acid polymer and a perfluorinated polymer diluent in a substantially nonpolar reaction mixture.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Francis J. Waller
  • Polyimide articles of intermediate electrical conductivity and a process for making them
    Patent number: 4986946
    Abstract: A polymeric article having high temperature performance and intermediate electrical conductivity is disclosed. The article has a matrix of polyimide and a filler of conductive particulate material. The degree of conductivity is controlled by an extraction step in the manufacturing process.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Darrell J. Parish
  • Fungicide compositions
    Patent number: 4987142
    Abstract: Compositions of azole fungicides exhibiting reduced eye irritation are prepared by replacing a significant portion of the hydrocarbon solvent with a combination of propylene glycol and a long chain fatty alcohol.
    Type: Grant
    Filed: October 3, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Stanley Tocker
  • Image-reversal process using photosensitive peel-apart elements
    Patent number: 4987051
    Abstract: This invention relates to an image reproduction process, more particularly a color proofing process, which utilizes a peel-apart photosensitive element comprising a strippable coversheet, a photohardenable layer, an elastomeric layer, and a support, to produce a positive image of the transparency on the coversheet and a negative image of the transparency on the elastomeric layer.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harvey W. Taylor, Jr.
  • Stabilization of poly(ether ketone ketones)
    Patent number: 4987171
    Abstract: Poly(ether ketone ketones), which are important engineering resins, are thermally stabilized by being contacted for at least 15 minutes above their glass transition temperature with an organic hydroperoxide containing at least 0.1 mg of active oxygen per gram, having a boiling point above about 130.degree. C., and degradable between 130.degree. C. and the contacting temperature, the hydroperoxide being made from a precursor comprising at least one benzylic or allylic hydrogen in its molecule.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Edward G. Brugel
  • Method and apparatus for maintaining desired exposure levels
    Patent number: 4987044
    Abstract: A radiation beam used for selectively exposing a surface is moved in a helical path by means of two oscillating mirrors vibrating about axes that are mutually perpendicular. By maintaining a constant product for oscillating frequency and rotational oscillatory mirror deflection, the level of exposure can be made substantially constant.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Resins with high surface areas and porosities
    Patent number: 4987157
    Abstract: Organic resins with high surface areas and porosities, which are insoluble in organic solvents and contain few or no flexible groups in the resin structure, are disclosed. Also disclosed is a process for making such resins from polyfunctional aryl alkali metal compounds and a second polyfunctional monomer. Such resins are useful as absorbants.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: January 22, 1991
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Bruce E. Smart, Owen W. Webster
  • Organic-based porous microspheres for HPLC
    Patent number: 4986908
    Abstract: Porous organic microspheres for use in HPLC are formed by coacervating a colloidal silica sol in a uniform mixture of the sol and a polymerizable organic material. The silica particles which formed the sol are removed from the microspheres with ammonium bifluoride. The remaining organic microspheres are rigid, have uniform pore sizes and distribution, and do not swell or shrink in the presence of the solvents used in HPLC.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Richard W. Stout, Henry J. Leibu
  • Crosslinking of aromatic ether containing polymers by halocarbons
    Patent number: 4987206
    Abstract: This invention relates to a process for cross-linking polymers that contain aromatic ether containing rings by heating the polymers together with selected halocarbon compounds. The crosslinked polymers have improved chemical resistance.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Israel A. David
  • Air handling system
    Patent number: 4986170
    Abstract: A branch take-off airflow device for use in an air distribution system that includes coaxial input and output ducts and one or more branch ducts having a status pressure regain section and a take-off section that has a central passageway and one or more take-off passageways. Each of the take-off passageways is generally rectangular in transverse cross-section and defined by inner and outer walls with the latter being a continuation of a wall defining the output opening of the regain section. The inner wall has a thick, rounded leading edge where the take-off passageway commences. In one preferred version, there is an elongate air flow defining member located centrally in the main passageway of both sections and extending in the axial direction. This member has a generally round, transverse cross-section with a maximum diameter equal to or less than the diameter of the hub of an adjacent axial fan.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: January 22, 1991
    Assignee: M & I Heat Transfer Products Ltd.
    Inventors: Ramani Ramakrishnan, Norman Ball
  • Photopolymerizable compositions with binders containing carboxyl groups
    Patent number: 4987054
    Abstract: Photopolymerizable compositions for image recording, containing, among other components, addition-polymerizable, ethylenically unsaturated compounds and polymeric binders, wherein at least one of these binders is a copolymer of the formula (I) containing 5 to 50 percent by weight of one or more different structural units C1, C2, or combinations thereof containing carboxyl groups.
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Manfred Sondergeld, Jonathan W. Goodin
  • Binary azeotropic compositions of 1-chloro-1,2,2-trifluorocyclobutane and methanol
    Patent number: 4986928
    Abstract: Azeotropic mixtures of 1-chloro-1,2,2-trifluorocyclobutane and methanol are useful in solvent cleaning applications and as refrigerants, aerosol propellants and polymer blowing agents.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Abid N. Merchant
  • Apparatus for driving an upwardly directed shaft in rock
    Patent number: 4986374
    Abstract: An apparatus for driving an upwardly directed shaft in rock, which includes a platform that can be regulated in height. The platform carries a drilling unit having engageable elements enabling fixation of the drilling unit relative the wall of the shaft. The drilling unit and platform can be separated a given distance such as to form an air gap for preventing the transfer of vibrations from the drilling unit to the platform when a drilling machine pertaining to the drilling unit is in operation. The apparatus has bracket elements and a transverse member for limiting the separation distance between the drilling unit and platform. The platform carries a work station for a drilling machine operator.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: January 22, 1991
    Assignee: Gruvprodukter I Gallivare AB
    Inventors: Ingemar Niemi, Lars-Erik Andersson
  • Placement process for oil field chemicals
    Patent number: 4986353
    Abstract: Oil field chemicals are incorporated in polymeric particles of the condensation product of hydroxyacetic acid or the co-condensation product of hydroxyacetic acid and other compounds containing hydroxy-, carboxylic acid-, or hydroxycarboxylic acid moieties. The particles are introduced into an oil well bore and/or subterranean oil formation where the polymeric particles dissolve over a period of time and release the oil field chemicals.
    Type: Grant
    Filed: September 14, 1988
    Date of Patent: January 22, 1991
    Assignees: Conoco Inc., E. I. DuPont de Nemours and Company
    Inventors: Charles R. Clark, Donald L. Whitfill, D. Philip Cords, Edward F. McBride, Harold E. Bellis
  • Process for etching polyimide substrate in formation of unsupported electrically conductive leads
    Patent number: 4986880
    Abstract: Formation of unsupported electrically conductive leads is obtained by etching of a polyimide substrate using an etching solution with a low etch ratio.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Jay R. Dorfman
  • Rotor assembly for an axial-flow combine
    Patent number: 4986794
    Abstract: An axial-flow combine with an improved rotor assembly which is configured to be less sensitive to crop material conditions. The rotor assembly includes a rotor casing with a rotor rotatably arranged therewithin. At its forward end, the rotor casing is provided with a transition section having a forward crop receiving end and an aft end. The rotor is provided with an impeller section which leads in a downstream direction to a threshing section. The impeller section of the rotor includes a plurality of impeller blades arranged within the transition section of the rotor assembly. A rearward end of each blade terminates upstream of the aft end of the transition section whereby allowing threshing instrumentalities on the threshing section of the rotor to extend into the transition section thereby extending the threshing area of the rotor thus enhancing crop material flow through the rotor assembly.
    Type: Grant
    Filed: April 3, 1990
    Date of Patent: January 22, 1991
    Assignee: J. I. Case Company
    Inventor: Jonathan E. Ricketts
  • Composition and placement process for oil field chemicals
    Patent number: 4986354
    Abstract: Oil field chemicals are incorporated in microcapsules of the condensation product of hydroxyacetic acid or the co-condensation product of hydroxyacetic acid and other compounds containing hydroxy-, carboxylic acid-, or hydroxycarboxylic acid moieties. The microcapsules are then introduced into an oil well bore and/or subterranean oil formation where the microcapsules dissolve over a period of time and release the oil field chemicals.
    Type: Grant
    Filed: September 14, 1988
    Date of Patent: January 22, 1991
    Assignees: Conoco Inc., E. I. DuPont de Nemours and Company
    Inventors: Lisa A. Cantu, Marvin E. Yost
  • Foldable measuring device
    Patent number: 4986464
    Abstract: A measuring device constructed from cellulosic material such as heavy paper or paperboard, metal, or a polymeric material, the material of construction having a predetermined geometric shape with creases segmenting the shaped material to facilitate folding, unfolding and refolding the device, the device being calibrated and useful for measuring particulate materials.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Joanne K. Leigh
  • Coating composition of an acrylic polymer containing glycidyl groups and acetoacetoxy groups and an amino ester acrylic polymer
    Patent number: 4987177
    Abstract: A coating composition which cures at ambient temperatures and contains 20-80% by weight of a binder and 80-20% by weight of a solvent for the binder, wherein the binder contains about:A. 60-80% by weight, based on the weight of the binder, of an acrylic polymer A of polymerized monomers of methyl methacrylate and monomers of styrene, alkylmethacrylate and/or alkyl acrylate each having 2-12 carbon atoms in the alkyl group and said polymer having pending from the polymer backbone aminoester groups, hydroxy aminoester groups or hydroxyamine groups,B.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Herman C. Den Hartog, George T. Palmer