Patents Assigned to I
  • Apparatus for determining flow behavior index
    Patent number: 5014545
    Abstract: An apparatus for on-line determination and control of the Flow Behavior Index of a molten polymer stream are disclosed along with methods for using the Index as a means for monitoring and controlling polymer quality. In particular, the Index may be used to monitor and control on-line the levels of branching in the polymer and the polymer's molecular weight distribution.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: May 14, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Sundar M. Rao
  • Process for recording semihalftone images and device for conversion of image dot tonal value data
    Patent number: 5014138
    Abstract: The invention provides for deciding whether a recording dot is to be printed for the reproduction of scan dots. The scan dots being considered are complied in an input switching network into groups, for which an arithmetic processor determines the tonal value sum. The arithmetic processor emits a signal, if the tonal value sum exceeds a certain figure. The recording dot to be printed is determined by the presence of the signal in an output switching network. This process is performed successively for increasingly larger areas of the original, that is, for increasingly larger quantities of scan dots.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gerhard Fischer, Helmut Quabeck
  • Stator assembly for a non-static cogging brushless DC motor and method of fabricating the same
    Patent number: 5013953
    Abstract: A stator assembly for a non-static cogging brushless DC motor includes a hollow coil forming member fabricated of a nonconductive and nonmagnetic material having an array of generally radially extending teeth. Each tooth has a pair of generally radially extending sidewalls that extend substantially the entire axial length of the coil forming member. A plurality of coils is wound on the teeth of the coil forming member so that the coils are disposed in surrounding relationship with respect to the radially extending sidewalls of the teeth. The teeth on the coil forming member may extend either radially inwardly or radially outwardly thereof.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Daniel M. C. Odell
  • Solid imaging system
    Patent number: 5014207
    Abstract: In a solid imaging system, the beam of a relatively high-powered beam radiation source, and more particularly a laser, is modulated in accordance with its varying vector sweep speed so that substantially constant layer depth is maintained at all scanner speeds in a strip of photohardenable composition as it hardens and solidifies in response to the source's irradiation.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John A. Lawton
  • Nucleic acid fragment encoding herbicide resistant plant acetolactate synthase
    Patent number: 5013659
    Abstract: A nucleic acid fragment encoding a herbicide-resistant plant acetolactate synthase protein is disclosed. This nucleic acid fragment contains at least one nucleotide mutation resulting in one amino acid change in one of seven substantially conserved regions of acetolactate synthase amino acid homology. This mutation results in the production of an acetolactate synthase protein which is resistant to sulfonylurea herbicide compounds compared to the wild-type protein. Transformation of herbicide sensitive plants or plant cells with the fragment results in resistance to the herbicide.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John R. Bedbrook, Roy S. Chaleff, Saverio C. Falco, Barbara J. Mazur, Christopher R. Somerville, Narendra S. Yadav
  • Permeator with selectable flow rates
    Patent number: 5013331
    Abstract: A permeable membrane apparatus having one or more hollow-fiber bundles enclosed in a single housing with end caps adapted so as to segment the bundles into a plurality of portions that can be separately used for fluid separation and its use.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Donald W. Edwards, Billy J. Etienne
  • Photopolymer film for holography
    Patent number: 5013632
    Abstract: Film speed of holographic photopolymer film containing polyvinyl acetate binder and an ethylenically unsaturated monomer is improved by including acrylic anhydride in the film.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Andrew M. Weber
  • Apparatus and process for forming alternate twist plied yarn and product therefrom
    Patent number: 5012636
    Abstract: A process for making alternate S and Z twist plied yarn from individual singles yarns includes the steps of tensioning the singles yarns as they move in a path through the process, twisting the individual yarns in either an S or Z direction, stopping the forward movement of the yarn, then bonding the ply-twisted yarns at a node while applying twist, stopping the twisting operation, then repeating the procedure while twisting in the opposite direction.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald E. Hallam, Peter Popper, Harold F. Staunton, Paul W. Yngve
  • Pyridinium aryl hydrazide compounds
    Patent number: 5013844
    Abstract: Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.
    Type: Grant
    Filed: December 15, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Reinhold Ruger
  • Processing aid for polymers
    Patent number: 5013792
    Abstract: Polymer blend composition having improved processibility and comprising:(a) a major portion of a difficultly melt-processible polymer, and(b) a minor portion of:(1) at least an effective amount, to improve processibility, of a fluorocarbon copolymer which at the melt-processing temperature of (a) is either in a melted form if crystalline, or is above its glass transition temperature if amorphous, and(2) at least an effective amount, to improve processibility, of at least one tetrafluoroethylene homopolymer or copolymer of tetrafluoroethylene and at least one monomer copolymerizable therewith, wherein the mole ratio of fluorine to hydrogen is at least 1:1, and which is solid at the melt-processing temperature of (a);masterbatches comprised of the processing aid; and processes utilizing the processing aid.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George R. Chapman, Jr., Donnan E. Priester, Charles W. Stewart
  • Method of expanding tobacco
    Patent number: 5012826
    Abstract: The invention is directed to a process for increasing the filling capacity of tobacco wherein tobacco is contacted with a mixture of an inert, normally gaseous expansion agent and about 15-35 weight percent of carbon dioxide at a pressure above the critical pressure of the mixture and a temperature above the critical temperature of the mixture, followed by rapid release of pressure to provide expanded tobacco without a subsequent heating step. Advantageously, the expansion agent is propane.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: May 7, 1991
    Assignee: R. I. Reynolds Tobacco Company
    Inventor: Anatoly I. Kramer
  • Animal repellant LLDPE
    Patent number: 5013551
    Abstract: Trash bags and other products from LLDPE are made animal repellent by incorporation of terpene in the LLDPE in the melt process for fabricating such products from the polymer.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Charles E. Atkinson
  • Adjustable dot gain simulation for color proofing
    Patent number: 5014086
    Abstract: The image dot gain that normally occurs in a printing press is controllably simulated as a separate step in the process of producing accurate color proofs. The simulation is attained by placing a diffuser plate between a high-intensity light source and a color-separated image master along with its corresponding image receptor. By varying the position of the diffuser plate the percentage of image dot gain is accurately controlled as an independent variable without the need to alter the exposure time.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert C. Barry
  • Capacitive liquid interface sensor
    Patent number: 5012683
    Abstract: A capacitive sensor is described having an element which traverses the outside of a container of liquid to ascertain the vertical locations of liquid interfaces in the container. The sensor uses an oscillator whose amplitude or phase is a function of the capacitance of the element.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: May 7, 1991
    Assignee: E. I. DuPont de Nemours and Company
    Inventor: James E. Davis
  • Composite fibrous polyethylene sheet
    Patent number: 5013599
    Abstract: A bonded composite sheet comprising a layer of flash-spun polyethylene plexifilamentary film-fibril strand sheet in face-to-face contact with a layer of polyethylene synthetic pulp is highly suited for detailed printing thereon.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Joseph R. Guckert, Hyun S. Lim
  • Acrylic amphoteric polymers
    Patent number: 5011898
    Abstract: Amphoteric polymers prepared by polymerization of (a) acrylic acid, (b) N,N-dimethyl- or N,N-diethylaminoethyl methacrylate and, optionally, (c) esters of methacrylic or acrylic acid prepared by (i) emulsion polymerization of (b), (c) and the methyl ester of (a), followed by basic hydrolysis, or (ii) polymerization of (a), (b) and (c) in the presence of a strong acid, and photographic emulsions comprised of said polymers in which the molar ratio of (a) to (b) is at least 2 to 1 and a silver halide.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: April 30, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert P. Foss
  • Angle-tilt-pitch mechanism for dozer blade
    Patent number: 5010961
    Abstract: An improved mechanism for connecting a ground-engaging blade to the frame of a vehicle is disclosed which allows the blade to tilt, pitch or angle relative to the frame. The disclosed arrangement includes a pair of hydraulic cylinders which control the tilting or pitching of the blade and a single hydraulic cylinder which controls the angling of the blade. The cylinders are all pivotally connected to an intermediate member which is pinned to the blade and guided through an arc on the frame by a guide bar formed on the frame. A single hydraulic circuit is disclosed which powers the pair of hydraulic cylinders to pitch or tilt the blade relative to the frame. The resulting arrangement is both simplified and relatively stable when compared to prior art structures.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: April 30, 1991
    Assignee: J. I. Case Company
    Inventor: Claude M. Frisbee
  • Pump tube mount and cartridge for infusion pump
    Patent number: 5011378
    Abstract: An infustion pump fluid source cartridge having a pump interface portion and a fluid source portion. The top edge of the cartridge is bevelled in the fluid source portion to permit bending of the fluid source portion to securely position the pump interface portion against the pump without distorting the pump interface portion. A pump tube mount is provided for insertion into such cartridge. The pump tube mount includes a uniquely shaped front wall and a rear wall which extends downward in order to butt up against a ledge. Tabs extend from the rear wall in order to snap into an opening beneath the ledge. A compressible tube is mounted in the tube mount by providing a cylindrical fitting having an indentation. The tube may be held in the indentation by a collar surrounding the tube in alignment with the indentation.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: April 30, 1991
    Assignee: I-Flow Corporation
    Inventors: Eric W. Brown, Charles M. Kienholz
  • Connector assembly with latching means
    Patent number: 5011425
    Abstract: A connector assembly (1,45;2) comprising a plug-in connector (1,45) and a socket connector (2). The plug-in connector (1,45) is provided with a lever-type locking element (5;15;25;40) having two free ends. At one free end an outwardly projecting pawl-type latching element (8;18;28;41) is disposed, while the other free end is designed as a gripping end (5';15';25';40'). The socket connector (2) is provided with a slot-type opening or recess (9), so that when the plug-in connector (1,45) is pushed into and mates with the socket connector (2), the latching element (8;18;28;41) engages the slot-type opening or recess (9), from the inside (2') of the socket connector (2), thereby latching the connectors (1,45;2).
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: April 30, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albertus Van Zanten, Johannes M. B. Van Woensel
  • Ceramic dielectric compositions and method for improving sinterability
    Patent number: 5011804
    Abstract: An improved ceramic dielectric composition for preparing multilayer ceramic structures for electronic devices and a method of enhancing the sinterability of such compositions at low firing temperatures by improving the distribution of zinc borate based sintering flux uniformly throughout the composition.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: April 30, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Horacio E. Bergna, Ian Burn