Patents by Inventor Pramod Gupta

Pramod Gupta 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).

  • Publication number: 20020192299
    Abstract: A method for treating gastric acid disorders with a non-enteric coated proton pump inhibitor in a pharmaceutically acceptable carrier including a bicarbonate salt of a Group IA metal and a carbonate salt of a Group IA metal; and a pharmaceutical composition of a non-enteric coated proton pump inhibitor in a pharmaceutically acceptable carrier including a bicarbonate salt of a Group IA metal and a carbonate salt of a Group IA metal are disclosed. A presently preferred proton pump inhibitor is lansoprazole, a presently preferred bicarbonate salt is sodium bicarbonate, and a presently preferred carbonate salt is sodium carbonate. The composition is a fast-acting formulation which reduces the undesirable belching associated with proton pump inhibitor formulations that contain high doses of sodium bicarbonate.
    Type: Application
    Filed: December 26, 2001
    Publication date: December 19, 2002
    Inventors: Rajneesh Taneja, Pramod Gupta
  • Patent number: 6492565
    Abstract: The present invention relates to a process for the preparation of polyether polyols by the reaction of alkylene oxides and compounds containing active hydrogens, in the presence of specific Lewis acid metal compounds as catalysts, novel bis(perfluoroalkylsulfonic acid) compounds of Group 13 of the Periodic Table of the Elements, and to a process for the preparation thereof and the use thereof as catalysts for ring-opening polymerization of cyclic ethers.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: December 10, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Denninger, Jörg Hofmann, Pramod Gupta
  • Patent number: 6486361
    Abstract: The invention relates to a process for the preparation of polyether polyols by means of double metal cyanide (DMC) catalysts, in which the induction phase is shortened markedly. By continuous dispensing of an alkylene oxide into the starter-catalyst mixture it is possible to achieve a substantial shortening of the induction phase by comparison with the batch-wise activation.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: November 26, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stephan Ehlers, Jörg Hofmann, Manfred Dietrich, Pramod Gupta, Christian Steinlein, Horst Zwick
  • Patent number: 6482993
    Abstract: This invention relates to a process for the production of long-chain polyether polyols without working up, in which oligomeric, alkoxylated starter compounds having molecular weights of 200 to 1000 are first obtained by catalysis with perfluoroalkylsulfonates of the metals of group III A of the periodic system of elements (in accordance with the IUPAC convention of 1970) from low molecular weight starters by reaction with alkylene oxides at reaction temperatures of 80 to 200° C. and catalyst concentrations of 5 to 200 ppm, which oligomeric, alkoxylated starter compounds are then converted without working up and removal of the catalyst by means of highly active DMC catalysts at a catalyst concentration of 30 ppm or below, relative to the quantity of polyether polyol to be produced, by reaction with alkylene oxides into higher molecular weight, long-chain polyether polyols.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: November 19, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Hofmann, Pramod Gupta
  • Patent number: 6468939
    Abstract: This invention relates to new double metal cyanide (DMC) catalysts, a process for the preparation of these DMC catalysts, and to a process for the production of polyether polyols by the polyaddition of alkylene oxides to starter compounds which comprise active hydrogen atoms, wherein the catalyst comprises a) one or more double metal cyanide compounds, b) one or more organic complexing ligands, and c) one or more organic phosphates, organic phosphites, organic phosphonates, organic phosphonites, organic phosphinates or organic phosphinites. The catalysts according to the invention exhibit a considerably increased activity for polyether polyol production.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: October 22, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pieter Ooms, Jörg Hofmann, Pramod Gupta
  • Patent number: 6458918
    Abstract: The present invention relates to a process for the preparation of novel, partially crystalline polyether polyols with a functionality of ≧2, an average molecular weight Mn of 500 to 100,000 and a molar proportion of isotactic triads determining the crystallinity of >28%. The new polyether polyols are prepared by polymerizing alkylene oxides in the presence of a bimetallic :-oxoalkoxide modified with hydroxyl compounds.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: October 1, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Schäfer, Jörg Hofmann, Pramod Gupta, Hanns-Peter Müller, Harald Pielartzik
  • Patent number: 6444720
    Abstract: Open-cell rigid foams containing urethane and/or isocyanurate and/or urea groups are produced with a long-chain polyether polyol having low double bond content.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: September 3, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bert Klesczewski, Jörg Hofmann, Pramod Gupta
  • Publication number: 20020068812
    Abstract: The invention relates to new improved double-metal cyanide (DMC) catalysts for the preparation of polyether-polyols by polyaddition of alkylene oxides on to starter compounds containing active hydrogen atoms, the catalyst comprising a double-metal cyanide compound, an organic complexing ligand and 5-80 wt. %, based on the amount of catalyst, of a polyester.
    Type: Application
    Filed: December 5, 2001
    Publication date: June 6, 2002
    Inventors: Jorg Hofmann, Pramod Gupta, Robert-Joseph Kumpf, Pieter Ooms, Walter Schafer
  • Patent number: 6391820
    Abstract: The invention relates to novel double-metal cyanide catalysts for the preparation of polyether polyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c), and c) glycoside. The catalysts according to the invention have greatly increased activity in the preparation of polyether polyols.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: May 21, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pieter Ooms, Jörg Hofmann, Pramod Gupta, Walter Schäfer
  • Patent number: 6376420
    Abstract: The invention relates to novel double metal cyanide (DMC) catalysts for the preparation of polyether polyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c), and c) polyalkylene glycol sorbitan esters. The catalysts according to the invention have greatly increased activity in the preparation of polyether polyols.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: April 23, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pieter Ooms, Jörg Hofmann, Pramod Gupta
  • Patent number: 6350920
    Abstract: Polyether polyols can be prepared by reacting polyols with epoxides in the presence of basic catalysts, by treating the polyether polyols containing the basic catalysts with OH-functional solid compounds of metals of groups III to VIII of the periodic system of the elements (Mendeleyev), the compounds being insoluble in the polyether polyols and having BET surface areas of from 10 to 1000 m2/g, isolating the solid inorganic compounds laden with the basic catalysts from the polyether polyol and using them in the reaction of polyols with epoxides, or bringing the isolated inorganic compounds laden with the basic catalysts into contact with the polyols that are to be used in the reaction with epoxides, separating those polyols from the inorganic compounds and delivering them to the reaction with epoxides.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: February 26, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Manfred Dietrich, Pramod Gupta, Pieter Ooms
  • Publication number: 20010053866
    Abstract: The present invention relates to a process for the preparation of polyether polyols by the reaction of alkylene oxides and compounds containing active hydrogens, in the presence of specific Lewis acid metal compounds as catalysts, novel bis(perfluoroalkylsulfonic acid) compounds of Group 13 of the Periodic Table of the Elements, and to a process for the preparation thereof and the use thereof as catalysts for ring-opening polymerization of cyclic ethers.
    Type: Application
    Filed: April 6, 2001
    Publication date: December 20, 2001
    Inventors: Uwe Denninger, Jorg Hofmann, Pramod Gupta
  • Patent number: 6323375
    Abstract: The present invention relates to highly active, substantially crystalline double metal cyanide (DMC) catalysts, a process for the preparation of these double metal cyanide catalysts, a process for producing polyether polyols by the polyaddition of alcohol ethers onto starter compounds containing active hydrogen atoms from these DMC catalysts, and to the polyether polyols produced by this process. The DMC catalysts of the invention comprise a) double metal cyanide compounds, b) organic complexing ligands, and c) functionalized polymers. These catalysts exhibit increased activity in the process for the production of polyether polyols.
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: November 27, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Hofmann, Pramod Gupta, Robert-Joseph Kumpf, Pieter Ooms, Walter Schäfer, Michael Schneider
  • Patent number: 6291388
    Abstract: The invention relates to new, improved double metal cyanide (DMC) catalysts for preparing polyetherpolyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a double metal cyanide compound, an organic coordination ligand and 5 to 80 wt. %, with respect to the amount of catalyst, of an ethylene oxide polyether with a number average molecular weight greater than 500. The new, improved catalysts have a greatly increased reactivity for polyetherpolyol preparation.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: September 18, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Hofmann, Pieter Ooms, Pramod Gupta, Walter Schäfer
  • Patent number: 6204357
    Abstract: The invention is directed to new double metal cyanide (DMC) catalysts, a process for the preparation of these catalysts, and to a process for the preparation of polyetherpolyols by the polyaddition of alkylene oxides to starter compounds which contain active hydrogen atoms, wherein the catalyst comprises the novel double metal cyanide (DMC) catalyst of the present invention. These new double metal cyanide (DMC) catalysts comprise a) one or more double metal cyanide compounds, b) one or more organic complex ligands, and c) one or more cyclodextrins, with the proviso that b) and c) are different compounds. The catalysts of this invention exhibit greatly increased activity during preparation of a polyetherpolyol.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: March 20, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pieter Ooms, Jörg Hofmann, Pramod Gupta, Lambertus Groenendaal
  • Patent number: 6093793
    Abstract: Polyether polyols are produced by acid-catalyzed polyaddition of alkylene oxides to starter compounds having active hydrogen atoms. Perfluoroalkylsulfonic acid salts of metals from Group IIIA of the Periodic Table of Elements (corresponding to the IUPAC Convention of 1970) are used as the catalyst. The polyaddition reaction is carried out at a temperature of from 40 to 200.degree. C. at normal pressure or pressures from 0 to 20 mbar (absolute). An inert organic solvent may optionally be included in the reaction mixture. Substantially all of the catalyst is removed from the polyether polyol-containing reaction mixture by lowering the temperature and/or by addition of a precipitating agent and/or by extraction with water. If desired, the recovered catalyst may be used in subsequent polyaddition reactions.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: July 25, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jorg Hofmann, Pramod Gupta, Harald Pielartzik
  • Patent number: 5998327
    Abstract: The invention relates to novel zinc/metal hexacyanocobaltate complex compounds corresponding to the formula:Zn.sub.3-v M.sub.v [Co(CN).sub.6 ].sub.2.w(H.sub.2 O).x(L).y[Zn(X).sub.n ].z[M(Y).sub.m)].These complex compounds are suitable catalysts. This invention also relates to a process for the production of the compounds, and to the use of the compounds in a process for the production of polyether polyols.These novel zinc/metal hexacyanocobaltate complex compounds when used as catalysts in a process for the production of polyether polyols substantially reduce the induction period of the polyaddition reaction of alkylene oxides to starter compounds containing hydrogen atoms. Furthermore, the resultant polyether polyols have a significantly narrower molecular weight distribution.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: December 7, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jorg Hofmann, Pramod Gupta, Harald Pielartzik, Pieter Ooms, Walter Schafer
  • Patent number: 5695689
    Abstract: .alpha.- and/or .beta.-tocopherol (vitamin E), optionally in combination with octylated diphenylamines, is combined with a polyether polyol having a molecular weight of from about 300 to about 10,000 to stabilize that polyether polyol. Polyether polyols which are stabilized in this manner are particularly useful in the production of polyurethanes and polyurethane foams with a reduced tendency toward discoloration.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: December 9, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pramod Gupta, Hansjurgen Rabe
  • Patent number: 5672768
    Abstract: Low-odor, higher molecular weight polyether polyols are produced by purifying the polyether polyols at temperatures of 110.degree. to 150.degree. C. and pressures of 10 to 70 hPa with the addition of 5 to 30% by weight of water, wherein the water is passed in finely divided form, with a droplet diameter of about 5 to 100.mu., through the polyether polyols to be purified for a time of metered addition of 1 to 5 hours.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: September 30, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pramod Gupta, Gundolf Jacobs, Joel Leuridan
  • Patent number: 5652319
    Abstract: Low-odor, higher molecular weight polyether polyols are produced by purifying the polyether polyols at temperatures of 110.degree. to 150.degree. C. and pressures of 10 to 70 hPa with the addition of 5 to 30% by weight of water, wherein the water is passed in finely divided form, with a droplet diameter of about 5 to 100 .mu., through the polyether polyols to be purified for a time of metered addition of 1 to 5 hours.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: July 29, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pramod Gupta, Gundolf Jacobs, Joel Leuridan