Patents by Inventor Hemant H. Patel

Hemant H. Patel 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).

  • Preparation of quinoline-substituted carbonate and carbamate derivatives
    Patent number: 7074932
    Abstract: The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: July 11, 2006
    Inventors: Michael S. Allen, Ramiya H. Premchandran, Sou-Jen Chang, Stephen Condon, John A. DeMattei, Steven A. King, Lawrence Kolaczkowski, Sukumar Manna, Paul J. Nichols, Hemant H. Patel, Subhash R. Patel, Daniel J. Plata, Eric J. Stoner, Jien-Heh J. Tien, Steven J. Wittenberger
  • Preparation of quinoline-substituted carbonate and carbamate derivatives
    Publication number: 20030199696
    Abstract: The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
    Type: Application
    Filed: May 7, 2003
    Publication date: October 23, 2003
    Inventors: Michael S. Allen, Ramiya H. Premchandran, Sou-Jen Chang, Stephen Condon, John A. DeMattei, Steven A. King, Lawrence Kolaczkowski, Sukumar Manna, Paul J. Nichols, Hemant H. Patel, Subhash R. Patel, Daniel J. Plata, Eric J. Stoner, Jien-Heh J. Tien, Steven J. Wittenberger
  • Preparation of quinoline-substituted carbonate and carbamate derivatives
    Patent number: 6579986
    Abstract: The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: June 17, 2003
    Assignee: Abbott Laboratories
    Inventors: Michael S. Allen, Ramiya H. Premchandran, Sou-Jen Chang, Stephen Condon, John A. DeMattei, Steven A. King, Lawrence Kolaczkowski, Sukumar Manna, Paul J. Nichols, Hemant H. Patel, Subhash R. Patel, Daniel J. Plata, Eric J. Stoner, Jien-Heh J. Tien, Steven J. Wittenberger
  • Preparation of quinoline-substituted carbonate and carbamate derivatives
    Publication number: 20020165390
    Abstract: The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
    Type: Application
    Filed: April 29, 2002
    Publication date: November 7, 2002
    Inventors: Michael S. Allen, Ramiya H. Premchandran, Sou-Jen Chang, Stephen Condon, John A. DeMattei, Steven A. King, Lawrence Kolaczkowski, Sukumar Manna, Paul J. Nichols, Hemant H. Patel, Subhash R. Patel, Daniel J. Plata, Eric J. Stoner, Jien-Heh J. Tien, Steven J. Wittenberger
  • Preparation of quinoline-substituted carbonate and carbamate derivatives
    Patent number: 6417366
    Abstract: The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: July 9, 2002
    Assignee: Abbott Laboratories
    Inventors: Michael S. Allen, Ramiya H. Premchandran, Sou-Jen Chang, Stephen Condon, John A. DeMattei, Steven A. King, Lawrence Kolaczkowski, Sukumar Manna, Paul J. Nichols, Hemant H. Patel, Subhash R. Patel, Daniel J. Plata, Eric J. Stoner, Jien-Heh J. Tien, Steven J. Wittenberger
  • Process for reduction of (2R)-4-oxoazetidinone-2-carboxylic acid
    Patent number: 6103911
    Abstract: The present invention relates to a process for the reduction of an azetidinone-carboxylic acid to an azetidine-alcohol.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: August 15, 2000
    Assignee: Abbott Laboratories
    Inventors: James E. Resek, Shyamal I. Parekh, Pulla R. Singam, Hemant H. Patel, Michael H. Cain, Bikshandarkoil A. Narayanan
  • Process for preparing N-demethyl-N-alkyl erythromycin derivatives
    Patent number: 6084079
    Abstract: The claimed invention relates to a novel process of preparing N-demethyl-N-alkyl-4"-deoxy erythromycin A and B. The process comprises protecting the 2'-hydroxy or the 2'- and 11-hydroxy of a N-demethyl-4"-deoxy erythromycin derivative having the formula: ##STR1## where R.sub.b is H or OH, with a silyl protecting group and alkylating the N-position of the desosamine sugar.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: July 4, 2000
    Inventors: Robert F. Keyes, Hemant H. Patel, Ramiya H. Premchandran, Albert V. Thomas, Anne H. Kemp
  • Chromic acid free etching of polymers for electroless plating
    Patent number: 5160600
    Abstract: The process of electroless plating of polymers containing units derived from at least one member of the group consisting of acrylonitrile, butadiene and styrene, is carried out in an environment free of chromium ions, by the sequential steps of roughening and activating the surface of the polymer by contacting the same with an aqueous solution of a concentrated sulfur acid, of concentrated nitric acid or of concentrated phosphoric acid, in the presence of noble metal ion and an oxidant selected from the group consisting of nitric acid, hydrogen peroxide and persulfates. This is followed by an aqueous suspension of Pd.sup.0 and then by the conventional chemical metallization.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: November 3, 1992
    Inventors: Gordhanbai N. Patel, Durgadas Bolikal, Hemant H. Patel