Patents Assigned to E
  • Multi-layer peel-apart photosensitive reproduction element containing a photorelease layer
    Patent number: 5001036
    Abstract: This invention relates to a peel-apart photosensitive element comprising a strippable coversheet, a photorelease layer, a photohardenable layer, an elastomeric layer, and a support, which is useful in a variety of image reproduction processes.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John H. Choi
  • Process for forming a composite structure of thermoplastic polymer and sheet molding compound
    Patent number: 5001000
    Abstract: A process for making a rigid composite structure with a thermoplastic polymer surface by:a. thermoforming a thermoplastic polymeric sheet into a three dimensional structure; the sheet has primary glass transition temperature that is at least 10.degree. C. greater than the molding temperature of step c. below;b. placing the thermoformed structure and a charge of sheet molding compound (SMC) in a mold andc. heating the charge and thermoformed structure under pressure in the mold to cure the SMC and to adhere the SMC to the thermoformed structure, where the molding temperature is at least 10.degree. C. below the primary glass transition temperature of the thermoplastic polymeric sheet;the resulting composite structure which can be finished with a paint or a layer of clear coat and color coat also is part of the invention.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Frank Rohrbacher, Patrick L. Spain, Roger A. Fahlsing
  • Spandex fiber with copolymer soft segment
    Patent number: 5000899
    Abstract: A elastic fibers are formed from spandex polymer that is prepared by reacting a glycol prepared from a tetrahydrofuran/3-methyltetrahydrofuran copolymer with a diisocyanate and then chain extending the thusly capped glycol with a particular mixture of diamines. The fibers have a highly desirable combination of power, hot-wet creep and heat-set efficiency and can be prepared at high spinning and windup speeds.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard L. Dreibelbis, Nathan E. Houser
  • N-(2-(2-oxo-1-imidazolidinyl)ethyl)-3-phenyl-urea and analogs as agents for induction of antioxidant enzymes
    Patent number: 5001141
    Abstract: N-[2-(2-oxo-1-imidazolidinyl)ethyl]-3-phenylurea and analogs are useful for protecting against oxygen-derived free radical damage in mammals, by inducing endogenous antioxidant enzymes, including superoxide dismutase, in mammals.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Janet S. Kerr, George A. Boswell
  • Nondusty spray dried mancozeb water-dispersible granules and the process for their production
    Patent number: 5001150
    Abstract: Non-dusty water-dispersible mancozeb granules (90%>100 micron diameter) are produced by a new process characterized by spray drying an aqueous slurry of .gtoreq.60% solids consisting of maneb or maneb dihydrate (5 microns, 50% 2-5 microns), a water soluble zinc salt and other formulation adjuvants.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Warren H. Yap
  • High modulus poly-p-phenylene terephthalamide fiber
    Patent number: 5001219
    Abstract: High modulus, high tenacity fibers of poly-p-phenylene terephthalamide (PPD-T) are disclosed along with a fiber heat treating process for increasing the inherent viscosity and the crystallinity index of the PPD-T. Never-dried fibers swollen with water of controlled acidity are heated beyond dryness.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Terry S. Chern, Stephan C. De La Veaux, Jacob Lahijani, James E. Van Trump
  • Optical resolution of DL-3-acylthio-2-methylpropanoic acid
    Patent number: 5001251
    Abstract: An optically active amine compound and a method for preparing same are provided which compound has the structure ##STR1## in the form of its R-(+) enantiomer or S-(-) enantiomer, wherein R and R.sup.1 are independently H, lower alkyl or halogen, R.sup.2 is H or lower alkyl and R.sup.3 is lower alkyl, the optically active amine is useful in the optical resolution of DL-3-acylthio-2-methylpropanoic acid wherein acyl is acetyl or benzoyl. The optically active D-(+)-3-acylthio-2-methylpropanoic acids are used as intermediated for preparing antihypertensive agents, such as captopril.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: March 19, 1991
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Patrick A. MacManus, Peter Walsh, Adrian J. Kilbane
  • Preparation of 4-pentenoic acid, amide or esters by isomerization
    Patent number: 5001257
    Abstract: Perfluorinated acid ion-exchange resins are highly effective catalysts for the isomerization of 3-pentenoic compounds to 4-pentenoic compounds, especially if the catalysts contain a group 8 metal in an oxidation state of at least +2.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patrick M. Burke, Francis J. Waller
  • Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole
    Patent number: 5000547
    Abstract: Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole with at least one fluoro comonomer selected from one or more of ten defined classes having a recited minimum mole proportion of perfluoro-2,2-dimethyl-1,3-dioxole, in no event less than 65%, have high glass transition temperatures of 140.degree. C. or higher, low indices of refraction, and good physical properties, and low dielectric constants, which make them suitable for cladding optical fibers as well as for many electronics applications, including the manufacture of substrates for circuit boards. They all are soluble at room temperature in perfluoro(2-butyltetrahydrofuran), which makes it practical to apply them as coatings from solution.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: March 19, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Edward N. Squire
  • Yarn handling device and method
    Patent number: 4999891
    Abstract: A yarn string-up gun is modified to include an entangling jet and a cut-down device eliminating the need to provide entangling jets for joining yarns on each yarn-spinning machine position for intermittent use.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Vilas G. Bankar
  • Stain-resistant aromatic/maleic anhydride polymers
    Patent number: 5001004
    Abstract: Stain-resistant, polyamide textile substrates treated with compositions comprising hydrolyzed ethylenically unsaturated aromatic/maleic anhydride polymers and processes for their preparation. The treated substrates possess stain resistance that is as good as or better than do previously known stain-resist treated substrates but do not suffer from yellowing to the extent that previously known treated substrates do.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patrick H. Fitzgerald, Nandakumar S. Rao, Yashavant V. Vinod, George K. Henry, Kenneth S. Prowse
  • Purification of saturated halocarbons
    Patent number: 5001287
    Abstract: A process for treating an impure mixture consisting essentially of at least one olefinic impurity and at least one saturated halocarbon selected from fluorocarbons and fluorohydrocarbons by contacting the mixture with a source of hydrogen in the presence of a hydrogenation catalyst, whereby the olefinic impurity is converted to a hydrogenated form thereof, to produce a treated mixture consisting essentially of the hydrogenated form of the olefinic impurity or impurities and the saturated halocarbon or halocarbons from the impure mixture.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard E. Fernandez, V. N. Mallikarjuna Rao
  • Conductive filled fluoropolymers
    Patent number: 5000875
    Abstract: Tetrafluoroethylene copolymer compositions containing conductive carbon black, graphite fiber or thermally conductive fillers have significantly increased conductivity when the tetrafluoroethylene copolymer has been treated with a fluorinating agent.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert J. Kolouch
  • Monitoring method for wastewater pump station and compatible apparatus
    Patent number: 4999117
    Abstract: A monitoring method for wastewater pump station performance and output, which method is capable of detecting an operating malfunction of the wastewater pump station such as a clog or leak within the pump, piping network or valves, or an output reduction due to pump wear. A monitoring apparatus placed at the wastewater pump staion performs continual monitoring of pump output values based on rates of rise of liquid level during pump non-run periods, time periods for the pump to reduce levels and resulting volume changes and at a controlled moment compares the values with measured reference values.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: March 12, 1991
    Assignee: Oy E. Sarlin AB
    Inventors: Jukka Palmu, Eero Oinonen, Leo Numminen, Jyrki Tolvanen, Martti Varis
  • Making new stretchable batts
    Patent number: 4999232
    Abstract: Improved stretchable battings of differentially-shrinkable bicomponent staple fibers are obtained by cross-lapping webs, e.g. from cards, garnets or the like machines, at an angle that determines and controls the degrees of stretch in the machine direction (MD) and cross direction (XD), and then inducing helical crimp in the bicomponent fibers on account of their differential shrinkage. Such batts are especially useful in apparel.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: March 12, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Martin D. LeVan
  • Combined bias supply power shut-off circuit
    Patent number: 4999516
    Abstract: A microcircuit bias-current supply in a wristwatch-pager. An FM-radio receiver in a microcircuit paging device operates intermittently with a short on-time and long off-time to reduce power consumption and preserve battery life. Ths bias-supply circuit distributes predetermined bias currents to a plurality of functional circuit areas of the microcircuit die, the bias currents being disabled during off-time of the receiver such that the current drain of the entire microcircuit is virtually zero, being in the range of nanoamps. The inefficiencies and disadvantages of a series switch to switch power on and off are eliminated by providing a plurality of switched current sources which perform the dual function of circuit biasing and current switching.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: March 12, 1991
    Assignee: AT&E Corporation
    Inventors: Richard R. Suter, Russell R. Moen, Jr.
  • Machine for pressure welding workpieces heated with arc moving in magnetic field
    Patent number: 4999476
    Abstract: The machine incorporates two clamping means, a static one fitted to a bedframe and a movable one mounted on rods which are attached to upsetting hydraulic cylinders with their ends with provision for reciprocating back and forth. Each clamping means consists of a base and a holding-down plate which is hinged to the base and displaced by a hydraulic cylinder a body of which is hinged to the base and a piston rod of which is hinged to the holding-down plate interacting with a holding down roller in clamping workpieces. The machine is provided with a fastener in the form of an inverted L-shaped lever, a means of adjusting the alignment of the workpieces for welding, and a means of setting a gap between the workpieces, made as a plunger and an adjustable stop installed coaxially.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: March 12, 1991
    Assignee: Institut Elektrosvarki Imeni E. O. Patona Akademii Nauk USSR
    Inventors: Sergei I. Kuchuk-Yatsenko, Valery G. Krivenko, Petr V. Kuznetsov, Vladimir J. Bogatyrev, Sergei I. Golovchenko, Vadim J. Ignatenko
  • Azeotropic composition of 2-chloro-1,1,2-trifluoroethyl-2-difluoromethyl ether with trans-1,2-dichloroethylene and methnanol
    Patent number: 4999127
    Abstract: Azeotropic mixtures of 2-chloro-1,1,2-triflurorethyl-2-difluoromethyl ether and trans-1,2-dichloroethylene with methanol, the azeotropic mixtures being useful in solvent cleaning applications.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: March 12, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Abid N. Merchant
  • Monofunctional alcohols to prevent gelation in two component isocyanate coatings
    Patent number: 4999213
    Abstract: An improved process for applying a two component polyurethane coating composition to a substrate; a stream of a polyol having reactive hydroxyl groups is mixed with a stream of an organic polyisocyanate crosslinking agent to form a blend that is applied to the substrate; the improvement used in this process is as follows:adding to the stream of polyol a monohydric primary or secondary alcohol in a ratio of about 0.5-2.0 equivalents of alcohol hydroxyl to polyol hydroxyl before mixing with the stream of organic polyisocyanate and before application to the substrate to prevent or substantially reduce the formation of gel particles;wherein the monohydric primary or secondary alcohol has a 90% evaporation rate at 25.degree. C. of less than 10,000 seconds as determined by ASTM D3539 using an Automatic Shell Thin Film Evaporator.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: March 12, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Walter C. Meyer
  • Tamper indicating containers and seals
    Patent number: 4998666
    Abstract: A seal comprising a substrate which is at least translucent to light having a transparent masking material disposed in an indicia-defining pattern on the inner surface of the substrate. A colorant layer is disposed over the masking material and extends beyond the pattern. There is an adhesive disposed at least over the area of the colorant. The present invention also includes a tamper indicating opaque container such as an envelope or carton has a window defined within the closure flap. A translucent or transparent panel overlaying the window has a transparent masking material of low adhesion properties disposed in an indicia-defining pattern. A colorant layer is disposed over the transparent masking material and an adhesive in turn is disposed over the colorant layer and transparent masking material.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 12, 1991
    Assignees: Frederick R. Ewan, Robert E. Ozimek
    Inventor: Frederick R. Ewan