Patents by Inventor Paul Maldonado

Paul Maldonado 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: 4422856
    Abstract: N-substituted succinimides are obtained by reacting in a first stage, maleic anhydride with an oxyalkylated or polyoxyalkylated monoalcohol of formulaR.sup.1 --O--A.sub.n OHwherein R.sup.1 is an aliphatic radical having from 12 to 25 carbon atoms, A is an alkylene radical having 2 to 4 carbon atoms and n is an integer from 1 to 50, and by further reacting the reaction product of the first stage either with a monoprimary amine of formulaR.sup.2 --X--Z.sub.m NH.sub.2or a bi-primary amine of the formulaH.sub.2 N--Z--NH.sub.p H,wherein R.sup.2 is an aliphatic radical having from 8 to 25 carbon atoms, Z is an alkylene radical having from 2 to 4 carbon atoms, X is --NH-- or --O--, m is an integer from 0 to 4 and p an integer from 2 to 6.The resultant succinimides are useful as anti-rust and detergent additives for motor fuels.
    Type: Grant
    Filed: February 13, 1981
    Date of Patent: December 27, 1983
    Assignees: Institut Francais du Petrole, Elf-France
    Inventors: Paul Maldonado, Choua Cohen, Bernard Sillion
  • Patent number: 4375974
    Abstract: A nitrogen-containing composition, useful as a detergent for gasoline, is obtained by reacting at least one unsaturated anhydride with at least one olefin to convert 20-80% of the anhydride and thereafter reacting the resultant product with a polyamine of the general formulaH.sub.2 N--[(--CH.sub.2 --)--.sub.n NH].sub.m R.sup.7wherein R.sup.7 is a monovalent aliphatic radical of 6-30 carbon atoms, n is an integer from 2 to 5 and m is an integer from 1 to 10.
    Type: Grant
    Filed: July 8, 1981
    Date of Patent: March 8, 1983
    Assignees: Institut Francais du Petrole, Societe Elf France
    Inventors: Paul Maldonado, Choua Cohen, Bernard Sillion
  • Patent number: 4374282
    Abstract: Ethers of polyols are prepared by reaction of a polyol and an organic chloride in a two phase medium in the presence of a phase transfer catalyst. The ethers of polyols are useful as synthetic lubricants, as lubricant bases, as lubricant additives and as fuel additives.
    Type: Grant
    Filed: October 15, 1980
    Date of Patent: February 15, 1983
    Assignee: Elf France
    Inventors: Paul Maldonado, Robert Nouguier, Jean-Claude Fayard, Robert Leger
  • Patent number: 4367074
    Abstract: Novel filter aid compositions enabling the improvement of limiting filterability temperature and the simultaneous inhibition of settling of the n-paraffin crystals formed at low temperature, comprising a mixture:of a compound A chosen from among the group of polymers or copolymers having a molecular weight between 500 and 15000 and having a branching rate between 10 and 30 points per 100 carbon atoms;and a compound B resulting from the condensation of at least one cyclic anhydride and at least one linear N-alkyl-polyamine;the weight ratio between these constituents A and B being from 1:20 to 20:1.
    Type: Grant
    Filed: September 16, 1981
    Date of Patent: January 4, 1983
    Assignee: Elf France
    Inventors: Paul Maldonado, Pierre Etchart, Daniele Eber
  • Patent number: 4353729
    Abstract: Microporous, fertilizing materials or compositions, retaining water and accelerating the germination and growth of plants, characterized in that they are composed of a hydrocarbon base containing asphaltenes modified by an oxidation agent producing a liberation of gas, directly, or indirectly, in combination with at least one mineral compound reacting in acid medium, to which materials or compositions it is possible to add, by simple mixing, appropriate common manures, oligo-elements and fertilizers.Method of preparation of fertilizing materials or compositions, characterized in that a non-acid oxidizing agent is mixed with a molten hydrocarbon base in a proportion of 25 to 50% by weight with 5 to 10% of a mineral compound, the mixture is kept for 5 to 7 hours at 180.degree.-250.degree. C., poured into metal trays, cooled, ground and screened into granules of a diameter ranging from 1 to 3 mm.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: October 12, 1982
    Assignee: Societe Nationale Elf Aquitaine
    Inventors: Alain Faure, Paul Maldonado, Jean-Francois Husson, Camille Coste
  • Patent number: 4330449
    Abstract: A method of preparation of polymer-asphalt (bitumen) compositions which comprises mixing, with agitation, at a temperature of 130.degree. to 230.degree. C., 80 to 98% by weight of an asphalt having a penetration between 30 to 220, and 2 to 20% by weight of a polyblock copolymer of a styrene-carboxylated conjugated diene having a mean molecular weight of 30,000 to 300,000, and maintaining this mixture for at least 2 hours at this temperature, then adding 0.1 to 3% of elemental sulfur, based on the asphalt, while maintaining the same conditions of agitation and temperature for at least 20 minutes, the carboxylated conjugated diene sequence being selected from the group consisting of carboxylated polybutadiene and carboxylated polyisoprene.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: May 18, 1982
    Assignee: Elf France
    Inventors: Paul Maldonado, Daniele Eber, Trung Kiet Phung
  • Patent number: 4264334
    Abstract: Heavy fuel-oil composition of improved stability under storage conditions, comprising a petroleum residue obtained from a straight run distillation, a vacuum distillation or a viscosity reduction of petroleum materials, a diluent such as a steam-cracking residue, a viscosity reduction gas oil or a mixture thereof, and a minor proportion of a sequenced copolymer formed of two polymeric sequences (A) and (B) wherein sequence (A) is obtained by polymerization of one or more conjugated diolefins such as 1,3-butadiene and isoprene and sequence (B) is obtained by polymerization of acrylonitrile or an alkylacrylonitrile such as methacrylonitrile, said sequenced copolymer having an average molecular weight by number of from 1,000 to 20,000.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: April 28, 1981
    Assignees: Institut Francais du Petrole, Elf-Union
    Inventors: Jean-Pierre Durand, Francois Dawans, Alain Faure, Paul Maldonado
  • Patent number: 4242246
    Abstract: This invention relates to a new process for the preparation of improved polymeric bitumens.The process is characterized by preparing a first composition by admixing a petroleum fraction (160.degree.-230.degree. C.), while stirring, at a temperature of from 80.degree. C. to 120.degree. C., with a copolymer made of styrenic blocks and dienic blocks such as a styrenebutadiene disequenced or multisequenced or statistical copolymer having a molecular weight varying between 30,000 and 300,000 and crystallized sulfur which is not chemically bound.When homogeneity is obtained, a portion of said first composition is admixed for at least 15 minutes at a temperature of from 130.degree. C. to 230.degree. C., with a conventional bitumen (penetration 20-220) to form a fluid polymeric bitumen.The fluid polymeric bitumen obtained by the process of the present invention is an excellent product characterized by superior properties and this product can be used in conventional spreading means when applying coatings onto roads.
    Type: Grant
    Filed: June 13, 1979
    Date of Patent: December 30, 1980
    Assignee: Elf Union
    Inventors: Paul Maldonado, Henri Dayre, Germain Hagenbach
  • Patent number: 4242143
    Abstract: A process for improving the properties of a bitumen which comprises mixing the bitumen with from about 5 to 20% by weight based on the bitumen, of a polyolefin wax at an elevated temperature for a period of time necessary to form a homogeneous mixture. The modified bitumen is particularly useful as a binder in asphalt to be used for casting.
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: December 30, 1980
    Assignee: Elf Union
    Inventors: Germain Hagenbach, Paul Maldonado
  • Patent number: 4237052
    Abstract: A process for the preparation of bitumen-polymer compositions, characterized by the fact that the bitumens are modified by grafting of a dihalopolybutadiene polymer that serves as a receptive structure to block polymers and to elastomers co-vulcanizable with the grafted bitumen.The elastomers are selected from the group that includes linear polybutadiene-polystyrene block copolymers, a polystyrene-polybutadiene block copolymer, and a vulcanizable polynorbornene rubber. They are used as road and industrial bitumens.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: December 2, 1980
    Assignee: Elf Union
    Inventors: Fredj Fitoussi, Paul Maldonado
  • Patent number: 4154710
    Abstract: A method of preparing novel bitumen compositions which comprises a first step wherein an olefinic unsaturated organic compound having a molecular weight varying between 300 and 30,000 is added to a bitumen having a penetration value varying between 30 and 220, and a second step wherein a polymer having a molecular weight varying between 100,000 and 2,000,000 is added to the product obtained from said first step.
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: May 15, 1979
    Assignee: Elf Union
    Inventors: Paul Maldonado, Robert Leger
  • Patent number: 4145322
    Abstract: The present invention is related to a novel process for preparing bitumen-polymer compositions. These compositions contain block copolymers comprising diene and styrene groups.The compositions present excellent mechanical properties even at low temperatures.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: March 20, 1979
    Assignee: Elf Union
    Inventors: Paul Maldonado, Jean Mas, Trung K. Phung
  • Patent number: 3997399
    Abstract: The invention relates to a process for the production of citric and osocitric acids by a culture of a diploid Candida Lipolytica yeast in a nutrient medium containing substances which are sources of carbon, nitrogen, and mineral compounds, the medium containing thiamin in a concentration in excess of 200 micrograms per liter.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: December 14, 1976
    Assignee: Institut Francais du Petrole, des Carburants et Lubrifiants et Entreprise de Recherches et d'Activities Petrolieres Elf
    Inventors: Paul Maldonado, Max Charpentier
  • Patent number: 3996106
    Abstract: This invention relates to the production of citric and/or isocitric acids. The production of citric and/or isocitric acids is effected by cultivating a citric and/or isocitric acid-producing yeast in a culture medium containing a compound selected from cyanoacetic acid, and organic and inorganic derivatives thereof. Increased yields of citric and isocitric acids are obtained using a process in accordance with the invention, preferably using a yeast of the genus Candida.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: December 7, 1976
    Assignee: Institut Francais du Petrole, des Carburants et Lubrifiants et Entreprise de Recherches et d'Activities Petrolieres Elf
    Inventors: Paul Maldonado, Max Charpentier, Georges Glikmans
  • Patent number: 3986933
    Abstract: A method of preparing a yeast enriched in L-lysine and capable of excreting an organic acid, such as citric acid, and possibly also isocitric and glutamic acids, when cultivated on a hydrocarbon-containing medium comprises subjecting a yeast of the species Candida lipolytica to the action of a mutagenic agent, such as a chemical agent or radiation, cultivating the thus-treated yeast in a culture medium containing a lysine analogue, preferably that to which the original yeast is most sensitive, in a concentration which is about 50 to 100 times greater than that to which the cells of the original yeast are most sensitive, and cultivating the resultant mutated resistant yeast on a medium containing at least one hydrocarbon such as a C.sub.10 -C.sub.20 normal paraffin as well as conventional nutrients, the cultivation preferably being effected in an agitated aerated medium at a pH of 3 to 6 and a temperature of 25.degree. to 30.degree. C..
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: October 19, 1976
    Assignee: Institut Francais du Petrol, des Carburants et Lubrifiants et Entreprise de Recherches et d'Activities Petrolieres Elf
    Inventors: Paul Maldonado, Claude Gaillaridin, Gaetan Sylvestre, Georges Glikmans
  • Patent number: 3966553
    Abstract: Process for manufacturing citric acid by aerobic culture of yeast strains in a medium containing at least one n-paraffin, comprising adding to the culture medium, after the phase of exponential growth thereof, a nitrogenous heterocyclic organic compound selected from .alpha.-picolinic acid, 2,6-dipicolinic acid, quinaldic acid, bi-pyridine, orthophenanthroline, 8-hydroxyquinoline and 5-hydroxyquinoxaline, at a concentration from 0.5 to 10 g/liter, and controlling the pH value of said medium during said growth phase by addition of sodium or potassium carbonate.
    Type: Grant
    Filed: December 6, 1973
    Date of Patent: June 29, 1976
    Assignee: Institut Francais du Petrole, des Carburants et Lubrifiants et Entreprise de Recherches et d'Activities Petrolieres Elf
    Inventors: Jean-Max Charpentier, Georges Glikmans, Paul Maldonado
  • Patent number: 3930946
    Abstract: A process for the preparation of a stable diploid of Candida lipolytica which comprises (a) in a first stage, separately cultivating two haploid strains of Candida lipolytica of opposed sign in a medium rich in assimilable carbon nutrient; (b) in a second stage, cultivating the two resultant strains together in a medium poor in assimilable carbon nutrient; and (c) in a third stage, after the appearance of diploid colonies, treating them with a mutagenic agent to stabilize them. The invention also comprises a process for the preparation of .alpha.-ketoglutaric acid which comprises cultivating a diploid strain obtained by crossing two Candida lipolytica haploid strains of opposite sign in a medium containing, as source of assimilable carbon, at least one hydrocarbon.
    Type: Grant
    Filed: November 26, 1973
    Date of Patent: January 6, 1976
    Assignees: Institut Francaise du Petrole, des Carburants et Lubrifiants, Institut Francais du Petrole
    Inventors: Paul Maldonado, Jean-Pierre Desmarquest, Claude Gaillardin, Daniel Binet