Patents by Inventor Vinayak Tripathi
Vinayak Tripathi 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).
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Patent number: 10538551Abstract: The present invention discloses a process for the preparation of pregnadiene derivatives having formula I, their stereoisomer and intermediate thereof.Type: GrantFiled: August 14, 2017Date of Patent: January 21, 2020Assignee: CORAL DRUGS PVT. LTD.Inventors: Vinayak Tripathi, Rajesh Kumar, Rohit Bhuwania, Binay Kumar Bhuwania
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Publication number: 20190177361Abstract: The present invention discloses a process for the preparation of pregnadiene derivatives having formula I, their stereoisomer and intermediate thereof.Type: ApplicationFiled: August 14, 2017Publication date: June 13, 2019Inventors: Vinayak TRIPATHI, Rajesh KUMAR, Rohit BHUWANIA, Binay Kumar BHUWANIA
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Patent number: 10233210Abstract: The present invention discloses a process for the preparation of 16, 17-acetals of pregnane derivatives having formula I wherein each substituent is independently selected from; R1 is H or CH3; R2 is C1-C6 linear or branched alkyl, alkynyl group or cycloalkyl group; aryl or heteroaryl group; or R1 and R2 combine to form saturated, unsaturated C3-C6 cyclic or heterocyclic ring; R3 and R4 are same or different and each independently represents H or halogen; R5 is —OH or —OCOR wherein R represents H or C1-C6 linear, branched or cyclic alkyl group that may be substituted.Type: GrantFiled: January 29, 2016Date of Patent: March 19, 2019Assignee: Coral Drugs Pvt. Ltd.Inventors: Vinayak Tripathi, Rajesh Kumar, Rohit Bhuwania, Binay Kumar Bhuwania
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Publication number: 20180002372Abstract: The present invention discloses a process for the preparation of 16, 17-acetals of pregnane derivatives having formula I wherein each substituent is independently selected from; R1 is H or CH3; R2 is C1-C6 linear or branched alkyl, alkynyl group or cycloalkyl group; aryl or heteroaryl group; or R1 and R2 combine to form saturated, unsaturated C3-C6 cyclic or heterocyclic ring; R3 and R4 are same or different and each independently represents H or halogen; R5 is —OH or —OCOR wherein R represents H or C1-C6 linear, branched or cyclic alkyl group that may be substituted.Type: ApplicationFiled: January 29, 2016Publication date: January 4, 2018Applicant: Coral Drugs Pvt. Ltd.Inventors: Vinayak TRIPATHI, Rajesh KUMAR, Rohit BHUWANIA, Binay Kumar BHUWANIA
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Patent number: 9630958Abstract: The present invention relates to novel triazine compounds of formula (1). The present invention also discloses compounds of formula I along with other pharmaceutical acceptable excipients and use of the compounds to modulate the PI3K/mTOR pathway.Type: GrantFiled: July 23, 2013Date of Patent: April 25, 2017Assignee: SPHAERA PHARMA PTE. LTD.Inventors: Sundeep Dugar, Dinesh Mahajan, Frank Hollinger Peter, Amit Sharma, Vinayak Tripathi, Bilash Kuila
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Patent number: 9556140Abstract: A process for synthesis of enatiomerically pure or enatiomerically enriched or racemic mixture of (+ and/or ?) epicatechin and its intermediates, comprising the steps of: (i) obtaining penta-protected quercetin; (ii) reducing the penta-protected quercetin obtained from step (i); (iii) optionally deprotecting the compound of step (ii); (iv) reducing the compound obtained from step (ii) or step (iii) in the presence of a chiral/achiral reducing agent to obtain a chiral intermediate; (v) deprotecting and/or hydrogenation of the chiral intermediate obtained from step (iv) to obtain (?)-epicatechin; (vi) optionally simultaneously deprotecting and by drogenation of the compound obtained from step (ii) to obtain racemic epicatechin.Type: GrantFiled: January 27, 2014Date of Patent: January 31, 2017Assignee: Sphaera Pharma Pvt. Ltd.Inventors: Sundeep Dugar, Dinesh Mahajan, Kumar Santosh Rai, Vinayak Tripathi, Ishwar Rakesh Patil
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Publication number: 20150368223Abstract: A process for synthesis of enatiomerically pure or enatiomerically enriched or racemic mixture of (+and/or?) epicatechin echm and its intermediates, comprising the steps of: (i) obtaining penta-protected quercetin; (ii) reducing the penta-protected quercetin obtained from step (i); (iii) optionally deprotecting the compound of step (ii); (iv) reducing the compound obtained from step (ii) or step (iii) in the presence of a chiral/achiral reducing agent to obtain a chiral intermediate; (v) deprotecting and/or hydrogenation of the chiral intermediate obtained from step (iv) to obtain (?)-epicatechin; (vi) optionally simultaneously deprotecting and by drogenation of the compound obtained from step (ii) to obtain racemic epicatechin.Type: ApplicationFiled: January 27, 2014Publication date: December 24, 2015Inventors: Sundeep Dugar, Dinesh Mahajan, Kumar Santosh Rai, Vinayak Tripathi, Ishwar Rakesh Patil
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Publication number: 20150197515Abstract: The present invention relates to novel triazine compounds of formula (1). The present invention also discloses compounds of formula I along with other pharmaceutical acceptable excipients and use of the compounds to modulate the PI3K/mTOR pathway.Type: ApplicationFiled: July 23, 2013Publication date: July 16, 2015Applicant: Sphaera Pharma Pte. Ltd.Inventors: Sundeep Dugar, Dinesh Mahajan, Frank Hollinger Peter, Amit Sharma, Vinayak Tripathi, Bilash Kuila
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Patent number: 8131300Abstract: In order to establish routing to/from a base station within a hybrid-cellular network, each network element is assigned a “class” based on a received signal strength of the base station. Each network element is allowed to choose a network element of lower class for relaying information to the base station.Type: GrantFiled: April 28, 2004Date of Patent: March 6, 2012Assignee: Motorola Solutions, Inc.Inventors: Philippe J. Sartori, Kevin L. Baum, Brian K. Classon, Vinayak Tripathi, Eugene Visotsky
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Patent number: 7088770Abstract: The invention provides an adaptive turbo decision feedback equalizer for executing an adaptive turbo decision feedback equalization method in response to a reception a packet including samples transmitted to the adaptive turbo decision feedback equalizer via a channel. The adaptive turbo decision feedback equalizer generates a first set of soft estimates of bits based upon a computation of a first feed-forward filter and a first feedback filter as a function of an estimation of the channel. The adaptive turbo decision feedback equalizer subsequently generates additional sets of soft estimates of the bits and a set of hard estimates of the bits based upon a computation of additional feed-forward filters and additional feedback filters as a function of a plurality of additional soft symbol estimates.Type: GrantFiled: October 19, 2001Date of Patent: August 8, 2006Assignee: Motorola, Inc.Inventors: Vinayak Tripathi, Michael L. Honig
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Publication number: 20050245270Abstract: In order to establish routing to/from a base station within a hybrid-cellular network, each network element is assigned a “class” based on a received signal strength of the base station. Each network element is allowed to choose a network element of lower class for relaying information to the base station.Type: ApplicationFiled: April 28, 2004Publication date: November 3, 2005Inventors: Philippe Sartori, Kevin Baum, Brian Classon, Vinayak Tripathi, Eugene Visotsky
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Patent number: 6671849Abstract: A communication system employs a HARQ-type retransmission scheme. Bits (701) received on a first transmission are stored and combined with the bits received on later transmissions thereby increasing the likelihood of a correct decoding on later transmissions. Similarly the bits received on the second or later transmissions are stored for combining with subsequent received bits. Specific information needed at the receiver is identified and requested from the transmitter. More particularly, information that is retransmitted in a second or later transmission in the HARQ scheme is determined from a reliability of individual constituent bits in the mother codeword or from an overall reliability of the received codeword. Based on these reliability metrics, the most unreliable set of the constituent bits are requested or, in the alternative, a specific number of constituent bits is requested.Type: GrantFiled: May 14, 2002Date of Patent: December 30, 2003Assignee: Motorola, Inc.Inventors: Vinayak Tripathi, Roger Peterson, Eugene Visotsky, Michael Honig
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Publication number: 20030217319Abstract: A communication system employs a HARQ-type retransmission scheme. Bits (701) received on a first transmission are stored and combined with the bits received on later transmissions thereby increasing the likelihood of a correct decoding on later transmissions. Similarly the bits received on the second or later transmissions are stored for combining with subsequent received bits. Specific information needed at the receiver is identified and requested from the transmitter. More particularly, information that is retransmitted in a second or later transmission in the HARQ scheme is determined from a reliability of individual constituent bits in the mother codeword or from an overall reliability of the received codeword. Based on these reliability metrics, the most unreliable set of the constituent bits are requested or, in the alternative, a specific number of constituent bits is requested.Type: ApplicationFiled: May 14, 2002Publication date: November 20, 2003Inventors: Vinayak Tripathi, Roger Peterson, Eugene Visotsky, Michael Honig
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Publication number: 20030095593Abstract: The invention provides an adaptive turbo decision feedback equalizer for executing an adaptive turbo decision feedback equalization method in response to a reception a packet including samples transmitted to the adaptive turbo decision feedback equalizer via a channel. The adaptive turbo decision feedback equalizer generates a first set of soft estimates of bits based upon a computation of a first feed-forward filter and a first feedback filter as a function of an estimation of the channel. The adaptive turbo decision feedback equalizer subsequently generates additional sets of soft estimates of the bits and a set of hard estimates of the bits based upon a computation of additional feed-forward filters and additional feedback filters as a function of a plurality of additional soft symbol estimates.Type: ApplicationFiled: October 19, 2001Publication date: May 22, 2003Inventors: Vinayak Tripathi, Michael L. Honig
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Patent number: 6441205Abstract: The invention provides a novel compound 4-(p-methoxy-phenyl)-2-aminobutane exhibiting growth inhibition and antifeedant activity and represented by the structural formula. C11H17ON=4-(p-methoxy phenyl)-2-amino butane and an insecticidal composition comprising an effective amount of the novel compound and appropriate adjuvant.Type: GrantFiled: May 19, 2000Date of Patent: August 27, 2002Assignee: Council of Scientific and Industrial ResearchInventors: Sunil Kumar Chattopadhyay, Koneni Venkata Sashidhara, Vinayak Tripathi, Arun Kumar Tripathi, Veena Prajapati, Sushil Kumar
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Publication number: 20020049353Abstract: The invention provides a novel compound 4-(p-methoxy-phenyl)-2-aminobutane exhibiting growth inhibition and antifeedant activity and represented by the structural formula.Type: ApplicationFiled: May 19, 2000Publication date: April 25, 2002Inventors: Sunil Kumar Chattopadhyay, Koneni Venkata Sashidhara, Vinayak Tripathi, Arun Kumar Tripathi, Veena Prajapati, Sushil Kumar
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Patent number: 6372922Abstract: The present invention relates to a process for the production of (−)3,4-divanillyl tetrahydrofiran of formula (2) which comprises (a) isolating) (−) secoisolariciresinol of formula (1) from the heartwood and roots of Taxus wallichiana by an improved process which consists of partitioning of the alcoholic extract of the heartwood and roots of T. wallichiana between water and chlorinated solvent, (b) extracting the chlorinated solvent extract with alkali and (c) isolating (−) secoisolariciresinol from the alkali extract upon neutralization with mineral acid and extracting with organic solvent and (d) crystallizing it from suitable organic solvent, (e) dissolving the isolated (−) secoisolariciresinol in suitable organic solvent and (f) reacting with triphenyl phosphine halide at 0-80° C. for 1-10 hours and (g) isolating (−) 3,4-divanillyl tetrahydrofuran by column chromatography.Type: GrantFiled: March 27, 2001Date of Patent: April 16, 2002Assignee: Council of Scientific and Industrial ResearchInventors: Sunil Kumar Chattopadhyay, Sachin Srivastava, Vinayak Tripathi
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Patent number: 6365757Abstract: This invention relates to a process for the production of a compound (+) catechin penta acetate of formula I from Taxus wallichiana tissue cultures which comprises : (a) inoculation of explants on different media compositions supplemented with combinations of auxins (1-5 mg/l) and cytokinins (0.1-1.0 mg/l); (b) incubation of the cultures under continuous light or dark conditions for 4-6 weeks for callus cultures followed by subculturing at 4-6 weeks intervals; (c) harvesting of the calli at different growth phases ranging from 12-36 months; (d) extraction of fresh pulverized calli with polar solvents at room temperature; (e) evaporating the solvent to give a residue; and partitioning of the residue between water and chlorinated solvents and evaporating the solvent to a semisolid mass; (f) subjecting the resultant mass to column chromatography over suitable adsorbent and (g) eluting with organic solvent/mixtures of organic solvents to get (+) catechin penta acetate.Type: GrantFiled: March 28, 2000Date of Patent: April 2, 2002Assignee: Council of Scientific and Industrial ResearchInventors: Sunil Kumar Chattopadhyay, Suchitra Banerjee, Shipra Agarwal, Koneni Venkata Sashidhara, Vinayak Tripathi, Arun Kumar Kukreja, Sushil Kumar, Manish Kulshrestha, Ram Prakash Sharma, Vijay Kumar Mehta
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Patent number: 6252114Abstract: The invention provides a process for the preparation of 4-(p-methoxyphenyl)-2-aminobutane represented by structural formula (1) as shown herein below: [C11H17ON=4-(p-methoxy phenyl)-2-amino butane] said process comprising the steps of, (a) isolating a phenolic compound 4-hydroxyphenyl)-butan-2-ol from the leaves of Taxus wallichiana by known methods, (b) treating the phenolic compound in aqueous mineral acid to obtain a phenolic halide derivative, (c) converting the phenolic halide derivative into its methyl ether by treating it with a methating agent, (d) reacting the methyl ether halide with azide to obtain an azido derivative, and (e) hydrogenating the azido compound to obtain 4-(p-methoxyphenyl)-2-aminobutane.Type: GrantFiled: March 24, 2000Date of Patent: June 26, 2001Assignee: Council of Scientific and Industrial ResearchInventors: Sunil Kumar Chattopadhyay, Koneni Venkata Sashidhara, Vinayak Tripathi, Arun Kumar Tripathi, Veena Prajapati, Sushil Kumar