Patents Assigned to Synthesis (U.S.A.)
  • Patent number: 5945457
    Abstract: A hemocompatible composition comprising a polymer containing at least one pharmacologic material chemically bonded to a polymer backbone. Such compositions may be obtained by reacting a pharmacologic material with a compound containing a polymerizable group (e.g., an acyl halide) and thereafter either copolymerizing the acylated material with one or more copolymerizable monomers or first irradiating a backbone polymer and thereafter grafting the acylated pharmacologic material onto the irradiated polymer. The resulting products are hemocompatible and may be used in the manufacture of medical devices which come in contact with blood or other bodily fluids. The advantage of chemically bonded pharmacologic materials is that they are not leached out and retain their pharmaceutical effectiveness for a long period of time. The compositions may contain one or more additional pharmacologic materials which are physically admixed with polymers containing bonded pharmacologic materials.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: August 31, 1999
    Assignee: A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Science
    Inventors: Nicolai A. Plate, Lev I. Valuev, Lubov D. Uzhinova, Vladimir A. Sinani
  • Patent number: 5929181
    Abstract: A method of preparing amorphous copolymers of ethylene and at least one norbornene (NB)-type comonomer is disclosed. These polymers may be random or alternating depending on the choice of catalyst and/or the relative ratio of the monomers used. This method comprises polymerizing said monomers in a diluent or in bulk in the presence of a neutral nickel catalyst which may be represented by the formula ##STR1## wherein Y may be a saturated or unsaturated hydrocarbyl chain, X may be oxygen or sulfur, E may be phosphorus, arsenic, antimony, oxygen or nitrogen, R and R' independently each is hydrogen or a hydrocarbyl group, L is a ligand containing a heteroatom P, N or O or L and R together with L may form part of a chelating structure in which case L is an ethylenic double bond.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: July 27, 1999
    Assignees: The B.F.Goodrich Co., A.V. Topchiev Institute of Petrochemical Synthesis
    Inventors: Kiryll Lvovich Makovetsky, Eugeny Shmerovich Finkelshtein, Viktor Ivanovich Bykov, Andrey Khristoforovich Bagdasaryan, Brian Leslie Goodall, Larry Funderburk Rhodes
  • Patent number: 5888466
    Abstract: An amorphous, micro/mesoporous silica-alumina gel with controlled pore size, having a surface area of at least 500 m.sup.2 /g and with a molar ratio of SiO.sub.2 :Al.sub.2 O.sub.3 of at least 30:1, is prepared by hydrolysing and causing a tetra-alkyl ammonium hydroxide, an aluminum trialkoxide, and a tetra-alkyl orthosilicate to gelate, by operating at a temperature equal to, or higher than, the boiling temperature, under atmospheric pressure, of any alcohols which are developed as a by-product from said hydrolysis reaction, without said alcohols being removed, or being substantially removed, from the reaction media; and the so produced gel being dried and fired.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: March 30, 1999
    Assignees: Eniricerche S.p.A., Agip Petroli S.p.A., Enichem Synthesis S.p.A.
    Inventors: Carlo Perego, Stefano Peratello, Roberto Millini
  • Patent number: 5888471
    Abstract: A synthetic, crystalline, porous material is disclosed, together with the related preparation process. Such material of zeolitic nature containing oxides of silicon, titanium and gallium corresponds, in the calcined and anhydrous state, to the following empyrical formula:pHGaO.sub.2.qTiO.sub.2.SiO.sub.2,wherein p has a value greater than zero and smaller than or equal to 0.050, and q has a value greater than zero and smaller than or equal to 0.025, and the H.sup.+ of HGaO.sub.2 can be at least partially replaceable or replaced by cations.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: March 30, 1999
    Assignees: Eniricerche S.p.A., Enichem Synthesis S.p.A., Snamprogetti
    Inventors: Giuseppe Bellussi, Mario Gabriele Clerici, Angela Carati, Antonio Esposito
  • Patent number: 5888224
    Abstract: An implant for the intervertebral space consists of an essentially cuboid body with a device for gripping by a tool.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: March 30, 1999
    Assignee: Synthesis (U.S.A.)
    Inventors: Louis Francois Charles Beckers, Johannes Fridolin Schlapfer
  • Patent number: 5811612
    Abstract: A catalytic composition is described for the alkylation or transalkylation of aromatic compounds consisting of zeolite Beta, as such or modified by the isomorphic substitution of aluminium with boron, iron or gallium or by the introduction of alkaline/earth-alkaline metals following ion exchange processes, and of an inorganic ligand, wherein the extrazeolite porosity, i.e. the porosity obtained by adding the mesoporosity and macroporosity fractions present in the catalytic composition itself, is such as to be composed for a fraction of at least 25% of pores with a radius higher than 100 .ANG..
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 22, 1998
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Gianni Girotti, Oscar Cappellazzo
  • Patent number: 5730908
    Abstract: A description follows of photochromatic and thermochromatic compounds, belonging to the group of spiro-indoline-oxazines, and their application in polymeric materials.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: March 24, 1998
    Assignee: Enichem Synthesis S.P.A.
    Inventors: Nereo Nodari, Pietro Allegrini, Luciana Crisci
  • Patent number: 5685957
    Abstract: Acidic and salt impurities are removed from a condensed phase obtained from dimethyl carbonate synthesis by obtaining the condensed phase from the effluent of a reactor in which carbon monoxide, oxygen and methanol are reacted to form dimethyl carbonate, the condensed phase containing acid and salt impurities, and partially evaporating the condensed phase in an evaporator thereby preparing an evaporated stream substantially free of impurities and a residual bottom stream.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: November 11, 1997
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Franco Rivetti, Daniele Delledonne
  • Patent number: 5686644
    Abstract: Dialkyl carbonate is prepared by reacting an alcohol with a gaseous mixture of carbon monoxide and oxygen in the presence of cuprous chloride as catalyst and hydrochloric acid as in situ regenerator of the catalyst.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: November 11, 1997
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Franco Rivetti, Ugo Romano
  • Patent number: 5672799
    Abstract: Process for the preparation of cumene by the alkylation of benzene with propylene, catalyzed by zeolite Beta into which certain quantities of suitable alkaline, alkaline-earth or metallic cations have been introduced by ion exchange.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: September 30, 1997
    Assignees: Eniricerche S.p.A., Enichem Synthesis S.p.A.
    Inventors: Carlo Perego, Giannino Pazzuconi, Gianni Girotti, Giuseppe Terzoni
  • Patent number: 5631395
    Abstract: Method for removing the acidic impurities contained in a vaporized stream consisting of an alkanol, an alkyl carbonate, water and still other organic species in minor amounts, which method consists in sending said stream to a solid adsorption reactor comprising alumina or activated charcoal.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: May 20, 1997
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Franco Rivetti, Daniele Delledonne
  • Patent number: 5625108
    Abstract: An amorphous, micro/mesoporous silica-alumina gel with controlled pore size, having a surface area of at least 500 m.sup.2 /g and with a molar ratio of SiO.sub.2 :Al.sub.2 O.sub.3 of at least 30:1, is prepared by hydrolysing and causing a tetra-alkyl ammonium hydroxide, an aluminum trialkoxide, and a tetra-alkyl orthosilicate to gelate, by operating at a temperature equal to, or higher than, the boiling temperature, under atmospheric pressure, of any alcohols which are developed as a by-product from said hydrolysis reaction, without said alcohols being removed, or being substantially removed, from the reaction media; and the so produced gel being dried and fired. So obtained gel is an active catalyst in hydrocarbon conversion reactions, in particular in light olefin isomerization and oligomerization processes, e.g., in propylene oligomerization processes to yield useful liquid hydrocarbons for gasoline and jet fuel formulation.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: April 29, 1997
    Assignees: Eniricerche S.p.A., AGIP Petroli S.p.A., Enichem Synthesis S.p.A.
    Inventors: Carlo Perego, Stefano Peratello, Roberto Millini
  • Patent number: 5602212
    Abstract: A linear copolyester is prepared by polycondensation of an aromatic bicarboxylic acid with an alkylene glycol and with a carboxyphosphinic acid or anhydride which produces monomeric units having the formula: ##STR1## wherein R.sub.1 is an alkylene or phenyl radical and R.sub.2 is an alkyl or phenyl radical.This copolyester can be used as a flame-retardant additive for organic polymers.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: February 11, 1997
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Carlo Neri, Gianluigi Landoni
  • Patent number: 5599876
    Abstract: A polymerizable liquid composition includesa polymerizable poly(allyl carbonate) of an aliphatic or cyclo-aliphatic polyol;an organic peroxide generator of free radicals selected from the group of perketals, and possiblyan organic dye and/or an organic photochromic compound.The compositions can be transformed, by bulk polymerization, into an organic glass which is colorless, or colored or photochromic, having good optical and mechanical characteristics.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: February 4, 1997
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Fiorenzo Renzi, Claudio Gagliardi, Franco Rivetti, Pietro Allegrini
  • Patent number: 5580916
    Abstract: A description follows of vulcanizable compositions of nitrile rubbers containing a plasticizer, a vulcanizing agent and normal additives, wherein the plasticizer is an organic carbonate selected from those which can be defined with the formula (I): ##STR1## or with the formula (II): ##STR2## wherein R, R.sup.1, R.sup.2, X and n are as defined in the description.
    Type: Grant
    Filed: March 9, 1994
    Date of Patent: December 3, 1996
    Assignee: Enichem, Synthesis S.p.A.
    Inventors: Enrico Traverso, Franco Rivetti, Lucio Spelta
  • Patent number: 5557607
    Abstract: An ATM switching system architecture of a switch fabric-type is built of, a plurality of ATM switch element circuits and routing table circuits for each physical connection to/from the switch fabric. A shared pool of memory is employed to eliminate the need to provide memory at every crosspoint. Each routing table maintains a marked interrupt linked list for storing information about which ones of its virtual channels are experiencing congestion. This linked list is available to a processor in the external workstation to alert the processor when a congestion condition exists in one of the virtual channels. The switch element circuit typically has up to eight 4-bit-wide nibble inputs and eight 4-bit-wide nibble outputs and is capable of connecting cells received at any of its inputs to any of its outputs, based on the information in a routing tag uniquely associated with each cell.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: September 17, 1996
    Assignees: Network Synthesis, Inc., Integrated Telecom Technology, Inc.
    Inventor: Brian D. Holden
  • Patent number: 5550207
    Abstract: A linear copolyester is prepared by polycondensation of an aromatic bicarboxylic acid with an alkylene glycol and with a carboxyphosphinic acid or anhydride which produces monomeric units having the formula: ##STR1## wherein R.sub.1 is an alkylene or phenyl radical and R.sub.2 is an alkyl or phenyl radical. This copolyester can be used as a flame-retardant additive for organic polymers.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: August 27, 1996
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Carlo Neri, Gianluigi Landoni
  • Patent number: 5536864
    Abstract: The reaction between methanol, carbon monoxide and oxygen for preparing dimethyl carbonate, in the presence of cuprous chloride as the catalyst, is carried out in a special reactor constituted by two parallel, vertical tubes, at the base of one of which the fresh gas and the recycle gas are fed; the reaction products are separated by partially condensing the recirculate vapors.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: July 16, 1996
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Giancarlo Paret, Gianni Donati, Maurizio Ghirardini
  • Patent number: 5527943
    Abstract: A method is described enabling HCl and possible entrained CuCl particulate to be removed from a gas-vapor stream leaving a dimethylcarbonate synthesis reactor. The contaminant removal is effected by one of the process fluids used in a small quantity.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: June 18, 1996
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Franco Rivetti, Ugo Romano, Guido Garone, Maurizio Ghirardini
  • Patent number: 5514254
    Abstract: An alkyl-aromatic compound is selectively photochlorinated in the side chain in a cyclic reaction system wherein said compound is continuously circulated between a container and photochlorination reactor.The compound is partially chlorinated after each passage through the photochlorination reactor, the number of passages depending on the degree of chlorination required.The procedure is particularly useful for the preparation of benzyl chloride, benzal chloride and benzotrichloride, and the corresponding halogen-substituted derivatives of the nucleus.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: May 7, 1996
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Carlo Ribaldo, Giuseppe Contardi, Vittorio Messori