Patents by Inventor Ashokkumar B. Shenvi

Ashokkumar B. Shenvi 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: 9463450
    Abstract: A highly fluorinated polymer is very useful as an acid catalyst. The highly fluorinated polymer has at least two repeating unit types that are the polymerized derivatives of a perfluorinated cyclic or cyclizable compound and a highly fluorinated vinyl ether compound having a sulfur containing functional group. The polymer can be formed by radical copolymerization of the fluorinated monomers with the sulfur-containing functional group in sulfonyl fluoride form (—SO2F) that is subsequently converted to sulfonic acid form (—SO3H). The highly fluorinated polymer can be used to advantage in a solution comprising an aprotic, polar organic solvent that has a dielectric constant of at least 15 and preferably is free of hydroxyl functional groups. Suitable solvents are those in which the polymer is soluble to at least 1 wt %. Hydroxyl group-containing protic, polar organic solvents are less preferred.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: October 11, 2016
    Assignee: Compact Membrane Systems, Inc.
    Inventors: Ning Shangguan, Andrew Feiring, Ashokkumar B. Shenvi
  • Publication number: 20160279623
    Abstract: A highly fluorinated polymer is very useful as an acid catalyst. The highly fluorinated polymer has at least two repeating unit types that are the polymerized derivatives of a perfluorinated cyclic or cyclizable compound and a highly fluorinated vinyl ether compound having a sulfur containing functional group. The polymer can be formed by radical copolymerization of the fluorinated monomers with the sulfur-containing functional group in sulfonyl fluoride form (—SO2F) that is subsequently converted to sulfonic acid form (—SO3H). The highly fluorinated polymer can be used to advantage in a solution comprising an aprotic, polar organic solvent that has a dielectric constant of at least 15 and preferably is free of hydroxyl functional groups. Suitable solvents are those in which the polymer is soluble to at least 1 wt %. Hydroxyl group-containing protic, polar organic solvents are less preferred.
    Type: Application
    Filed: March 23, 2016
    Publication date: September 29, 2016
    Applicant: Compact Membrane Systems, Inc.
    Inventors: Ning Shangguan, Andrew Feiring, Ashokkumar B. Shenvi
  • Patent number: 6355695
    Abstract: Compounds of formula I wherein Q1, Q2, Q3, Q4 and Q5 have any of the meanings given in the specification, their N-oxides, and their pharmacuetically acceptable salts are nonpeptide antagonists NKA, useful for the treatment of asthma, etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: March 12, 2002
    Assignee: Zeneca Limited
    Inventors: Scott C. Miller, Robert T. Jacobs, Ashokkumar B. Shenvi
  • Patent number: 6235757
    Abstract: Compounds of formula I wherein Q1, Q2, Q3, Q4 and Q5 have any of the meanings given in the specification, their N-oxides, and their pharmacuetically acceptable salts are nonpeptide antagonists NKA, useful for the treatment of asthma, etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: May 22, 2001
    Assignee: Zeneca Limited
    Inventors: Scott C. Miller, Robert T. Jacobs, Ashokkumar B. Shenvi
  • Patent number: 6051580
    Abstract: Compounds of formula I ##STR1## wherein Q.sup.1, Q.sup.2, Q.sup.3, Q.sup.4 and Q.sup.5 have any of the meanings given in the specification, their N-oxides, and their pharmaceutically acceptable salts are nonpeptide antagonists NKA, useful for the treatment of asthma etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: April 18, 2000
    Assignee: Zeneca Limited
    Inventors: Scott C. Miller, Robert T. Jacobs, Ashokkumar B. Shenvi
  • Patent number: 5889024
    Abstract: Compounds of formula I ##STR1## wherein Q.sup.1, Q.sup.2, Q.sup.3, Q.sup.4 and Q.sup.5 have any of the meanings given in the specification, their N-oxides, and their pharmacuetically acceptable salts are nonpeptide antagonists NKA, useful for the treatment of asthma, etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: April 23, 1996
    Date of Patent: March 30, 1999
    Assignee: Zeneca Limited
    Inventors: Scott C. Miller, Robert T. Jacobs, Ashokkumar B. Shenvi
  • Patent number: 5635509
    Abstract: Compounds of formula I ##STR1## wherein Q.sup.1, Q.sup.2, Q.sup.3, and Q.sup.4 have any of the meanings given in the specification, their N-oxides, and their pharmaceutically acceptable salts are nonpeptide antagonists of neurokinin A and useful for the treatment of asthma, etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: June 3, 1997
    Assignee: Zeneca Limited
    Inventors: Robert T. Jacobs, Scott C. Miller, Ashokkumar B. Shenvi, Cyrus J. Ohnmacht, Jr., Chris A. Veale
  • Patent number: 5589489
    Abstract: Compounds of formula I ##STR1## wherein Q.sup.1, Q.sup.2, Q.sup.3, and Q.sup.4 have any of the meanings given in the specification, their N-oxides, and their pharmaceutically acceptable salts are nonpeptide antagonists of neurokinin A and useful for the treatment of asthma, etc. Also disclosed are pharmaceutical compositions, processes for preparing the compounds of formula I and intermediates.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: December 31, 1996
    Assignee: Zeneca Limited
    Inventors: Ashokkumar B. Shenvi, Robert T. Jacobs, Scott C. Miller, Cyrus J. Ohnmacht, Jr., Chris A. Veale
  • Patent number: 5521199
    Abstract: The present invention concerns the novel alkyl substituted heterocycles of formula I, set out below, wherein Q, Q.sup.1, Q.sup.2 and R have the values defined herein, which antagonize the pharmacological actions of one of the endogenous neuropeptide tachykinins at the neurokinin 2 (NK.sup.2) receptor making them useful whenever such antagonism is desired, such as in the treatment of asthma and related conditions. The invention also provides pharmaceutical compositions containing the alkyl substituted heterocycles for use in such treatment, methods for their use, and processes and novel intermediates for their manufacture.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: May 28, 1996
    Assignee: Zeneca Limited
    Inventors: Robert T. Jacobs, Ashokkumar B. Shenvi
  • Patent number: 5250720
    Abstract: Intermediates for the preparation of Peptides comprising C-terminal boronic acid derivatives of lysine, ornithine, and arginine, homoarginine and corresponding isothiouronium analogs thereof, are reversible inhibitors of trypsin-like serine proteases such as thrombin, plasma kallikrein and plasmin.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: October 5, 1993
    Assignee: The Dupont Merck Pharmaceutical Company
    Inventors: Charles A. Kettner, Ashokkumar B. Shenvi
  • Patent number: 5242904
    Abstract: Peptides comprising C-terminal boronic acid derivatives of lysine, ornithine, and arginine, homoarginine and corresponding isothiouronium analogs thereof, are reversible inhibitors of trypsin-like serine proteases such as thrombin, plasma kallikrein and plasmin.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: September 7, 1993
    Assignee: The Dupont Merck Pharmaceutical Company
    Inventors: Charles A. Kettner, Ashokkumar B. Shenvi
  • Patent number: 5187157
    Abstract: Peptides comprising C-terminal boronic acid derivatives of lysine, ornithine, and arginine, homoarginine and corresponding isothiouronium analogs thereof, are reversible inhibitors of trypsin-like serine proteases such as thrombin, plasma kallikrein and plasmin.
    Type: Grant
    Filed: April 6, 1988
    Date of Patent: February 16, 1993
    Assignee: Du Pont Merck Pharmaceutical Company
    Inventors: Charles A. Kettner, Ashokkumar B. Shenvi
  • Patent number: 4692528
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3.2.1]-octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl]-7-oxa-2-azabicyclo[3.2.1]octane in which L is a leaving group selected from the group consisting of --Cl, --Br, --I, p-MeC.sub.6 H.sub.4 SO.sub.3 and MeSO.sub.3 --.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: September 8, 1987
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Ashokkumar B. Shenvi
  • Patent number: 4579952
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3.2.1]octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl]-7-oxa-2-azabicyclo[3.2.1]octane in which L is a leaving group selected from the group consisting of --Cl, --Br, --I, p-MeC.sub.6 H.sub.4 SO.sub.3 -- and MeSO.sub.3 --.
    Type: Grant
    Filed: July 25, 1983
    Date of Patent: April 1, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Engelbert Ciganek, Ashokkumar B. Shenvi
  • Patent number: 4537963
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3,2.1]-octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl]-7-oxa-2-azabicyclo[3.3.1]octane in which L is a leaving group selected from the group consisting of --Cl, --Br, --I, p--MeC.sub.6 H.sub.4 SO.sub.3 -- and MeSO.sub.3 --.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: August 27, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ashokkumar B. Shenvi
  • Patent number: 4537773
    Abstract: .alpha.-Aminoboronic acids and derivatives of formula ##STR1## are potent, reversible inhibitors of aminopeptidases.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: August 27, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ashokkumar B. Shenvi
  • Patent number: 4499082
    Abstract: Peptides comprising C-terminal .alpha.-aminoboronic acid residues are potent, reversible inhibitors of proteolytic enzymes.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: February 12, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ashokkumar B. Shenvi, Charles A. Kettner
  • Patent number: 4421916
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3.2.1]-octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl-7-oxa-2-azabicyclo[3.2.1]octane in which L is a leaving group selected from the group consisting of --Cl, --Br, --I, p-MeC.sub.6 H.sub.4 SO.sub.3 -- and MeSO.sub.3 --.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: December 20, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Ashokkumar B. Shenvi
  • Patent number: 4415736
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3.2.1]-octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl]-7-oxa-2-azabicyclo[3.2.1]octane in which L is a leaving group selected from the group consisting of -Cl, -Br, -I, p-MeC.sub.6 H.sub.4 SO.sub.3 - and MeSO.sub.3 -.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Engelbert Ciganek, Ashokkumar B. Shenvi