Patents by Inventor Srinivas Nagabandi

Srinivas Nagabandi 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).

  • Process for the synthesis of an aliphatic cyclic amine
    Patent number: 6528647
    Abstract: Disclosed is a process for selectively producing aliphatic cyclic amines which comprises reacting a dihydric alcohol characterized by four to six carbons, preferably 1,5-pentane diol, with excess ammonia in presence of ZSM-5 catalyst modified with group of elements nickel, copper or cobalt-containing, at a temperature of at least 250° C., wherein said catalyst incorporates at least one metal.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: March 4, 2003
    Assignee: Council of Scientific and Industrial Research
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Rani Vippagunta, Srinivas Nagabandi
  • Process for synthesis of a porphyrin compound using a molecular sieve catalyst under microwave irradiation
    Patent number: 6524446
    Abstract: The present invention provides an improved process for synthesis of porphyrin compounds of the general formula 1 from pyrrole and aromatic aldehyde over zeolite molecular sieve catalysts using microwave heating, (solvent free) to provide an eco-friendly, economical, faster and selective heterogeneous method.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: February 25, 2003
    Assignee: Council of Scientific and Industrial Research
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Kishan Motkuri, Srinivas Nagabandi
  • Process for the synthesis of an annulated pyridine base
    Patent number: 6495690
    Abstract: This invention relates to process for producing annulated pyridine bases by reacting cyclic ketones with aliphatic aldehyde in presence of ammonia in gaseous phase in the presence of a catalyst. This process provides an eco-friendly, more economical and highly selective heterogeneous method.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: December 17, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Rani Vippagunta, Srinivas Nagabandi
  • Process for the preparation of a collidine and 2,3,5,6-tetramethyl pyridine
    Patent number: 6495695
    Abstract: The present invention provides a process for synthesis of tri- and tetra-alkylated pyridines (i.e. collidines) in high yields by reacting methyl ethyl ketone with formaldehyde in presence of ammonia in gas phase in the presence of a zeolite catalyst which comprises of silica-alumina with at least one metal ion and/or metal selected from the group consisting of lanthanum, lead, manganese, iron, copper and cobalt. This process provides eco-friendly, more economical and shape-selective heterogeneous method.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: December 17, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Srinivas Nagabandi, Radha Rani Vippagunta
  • Process for the synthesis of an aryl pyridine base using a zeolite catalyst
    Patent number: 6492524
    Abstract: The present invention provides an improved process for the synthesis of aryl pyridine bases by reacting an aromatic aldehyde or ketone and allylic alcohol or aldehyde in presence of ammonia in gas phase, in high yield and selectivity with catalyst obtained by optionally modifying a zeolite having an atomic ratio of Si to Al, 2.5 to 12.5 and /or with at least one metal ion and/or metal compound selected from the group consisting of lead and lanthanum. This process provides an eco-friendly, more economical and highly selective heterogeneous method.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: December 10, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Srinivas Nagabandi, Radha Rani Vippagunta
  • Process for the synthesis of an aliphatic cyclic amine
    Publication number: 20020183517
    Abstract: Disclosed is a process for selectively producing aliphatic cyclic amines which comprises reacting a dihydric alcohol characterized by four to six carbons, preferably 1,5-pentane diol, with excess ammonia in presence of ZSM-5 catalyst modified with group of elements nickel, copper or cobalt-containing, at a temperature of at least 250° C., wherein said catalyst incorporates at least one metal.
    Type: Application
    Filed: March 27, 2001
    Publication date: December 5, 2002
    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Rani Vippagunta, Srinivas Nagabandi
  • Process for the preparation of a collidine and 2,3,5,6-tetramethyl pyridine
    Publication number: 20020173660
    Abstract: The present invention provides a process for synthesis of tri- and tetra-alkylated pyridines (i.e. collidines) in high yields by reacting methyl ethyl ketone with formaldehyde in presence of ammonia in gas phase in the presence of a zeolite catalyst which comprises of silica-alumina with atleast one metal ion and/or metal selected from the group consisting of lanthanum, lead, manganese, iron, copper and cobalt. This process provides eco-friendly, more economical and shape-selective heterogeneous method.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 21, 2002
    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Srinivas Nagabandi, Radha Rani Vippagunta
  • Process for the synthesis of an annulated pyridine base
    Publication number: 20020173651
    Abstract: This invention relates to process for producing annulated pyridine bases by reacting cyclic ketones with aliphatic aldehyde in presence of ammonia in gaseous phase in the presence of a catalyst. This process provides an eco-friendly, more economical and highly selective heterogeneous method.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 21, 2002
    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Rani Vippagunta, Srinivas Nagabandi
  • Process for synthesis of a porphyrin compound using a molecular sieve catalyst under microwave irradiation
    Publication number: 20020143175
    Abstract: The present invention provides an improved process for synthesis of porphyrin compounds of the general formula 1 1
    Type: Application
    Filed: March 27, 2001
    Publication date: October 3, 2002
    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Shivanand Janardan Kulkarni, Kondapuram Vijaya Raghavan, Radha Kishan Motkuri, Srinivas Nagabandi