Patents by Inventor Karanam Balasubramanyam
Karanam Balasubramanyam 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: 7750047Abstract: The invention provides the use of certain benzoic acid and benzamide compounds as modulators of enzymes histone acetyltransferases, which are involved in gene expression and cancer and also use of such compounds in the treatment of diseases due to defects in gene regulation predominantly cancer.Type: GrantFiled: December 19, 2007Date of Patent: July 6, 2010Assignee: Jawaharlal Nehru Centre for Advanced Scientific ResearchInventors: Tapas Kumar Kundu, Karanam Balasubramanyam, Venkatesh Swaminathan
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Publication number: 20090076155Abstract: The invention provides the use of certain benzoic acid and benzamide compounds as modulators of enzymes histone acetyltransferases, which are involved in gene expression and cancer and also use of such compounds in the treatment of diseases due to defects in gene regulation predominantly cancer.Type: ApplicationFiled: December 19, 2007Publication date: March 19, 2009Inventors: Tapas Kumar Kundu, Karanam Balasubramanyam, Venkatesh Swaminathan
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Patent number: 7402706Abstract: In this patent we describe the purification of prenylated benzophenones from the fruit rinds of Garcinia species and its evaluation as an inhibitor for Histone acetyltransferases p300 and PCAF. We have found that prenylated benzophenones are potent HAT inhibitors of p300 (IC50-1 ?M) and pCAF (IC50-15 ?M). The inhibitors significantly repress the p300 HAT dependent transcriptional activation from in vitro assembled chromatin template but had no effect on transcription from DNA. These results suggest that the compounds could be specific to HATs. Thus these compounds should be useful as biological switching molecule for evaluating the role of p300 and PCAF in cellular functions and may be useful as new chemical entities for the development of anticancer drugs.Type: GrantFiled: November 4, 2004Date of Patent: July 22, 2008Assignee: Jawaharlal Nehru Centre for Advanced Scientific ResearchInventors: Kundu Tapas Kumar, Karanam Balasubramanyam, Kempegowda Mantelingu, Altaf Mohammad, Venkatesh Swaminathan, A. Varier Radhika
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Patent number: 7332629Abstract: Disclosed are compounds of the formulae: and method of using the compounds to treat cancer, AIDS, HIV infection, and asthma.Type: GrantFiled: December 12, 2003Date of Patent: February 19, 2008Assignee: Jawaharlal Nehru Centre for Advanced Scientific ResearchInventors: Tapas Kumar Kundu, Karanam Balasubramanyam, Vankatesh Swaminathan
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Publication number: 20070254961Abstract: In this patent we describe the purification of prenylated benzophenones from the fruit rinds of Garcinia species and its evaluation as an inhibitor for Histone acetyltransferases p300 and PCAF. We have found that prenylated benzophenones are potent HAT inhibitors of p300 (IC50-1 ?M) and pCAF (IC50-15 ?M). The inhibitors significantly repress the p300 HAT dependent transcriptional activation from in vitro assembled chromatin template but had no effect on transcription from DNA. These results suggest that the compounds could be specific to HATs. Thus these compounds should be useful as biological switching molecule for evaluating the role of p300 and PCAF in cellular functions and may be useful as new chemical entities for the development of anticancer drugs.Type: ApplicationFiled: November 4, 2004Publication date: November 1, 2007Applicant: JAWAHARLAL NEHRU CENTRE FOR ADVANCED SCIENTIFIC RESEARCHInventors: Kundu Tapas Kumar, Karanam Balasubramanyam, Kempegowda Mantelingu, Altaf Mohammad, Venkatesh Swaminathan, A. Radhika
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Publication number: 20060167107Abstract: Disclosed are compounds of the formulae: and method of using the compounds to treat cancer, AIDS, HIV infection, and asthma.Type: ApplicationFiled: December 12, 2003Publication date: July 27, 2006Inventors: Tapas Kundu, Karanam Balasubramanyam, Vankatesh Swaminathan
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Publication number: 20060020027Abstract: Compounds having the formula and derivatives thereof are used to inhibit histone acetyltransferases.Type: ApplicationFiled: June 10, 2005Publication date: January 26, 2006Inventors: Karanam Balasubramanyam, Radihika Varier, Altaf M, Swaminathan V, Tapas Kundu
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Publication number: 20050095831Abstract: Under the present invention, a layer of amorphous silicon is formed over a layer of gate dielectric. Over the layer of amorphous silicon, a gate cap dielectric is formed. The layer of amorphous silicon is then confined by at least one spacer, which is deposited under a low temperature process. Once the at least one spacer is in place, the amorphous silicon is exposed to a temperature sufficiently high to convert the amorphous silicon to polysilicon.Type: ApplicationFiled: November 4, 2003Publication date: May 5, 2005Applicant: International Business Machines CorporationInventors: Karanam Balasubramanyam, Serge Biesemans, Byeongju Park
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Patent number: 6884672Abstract: Under the present invention, a layer of amorphous silicon is formed over a layer of gate dielectric. Over the layer of amorphous silicon, a gate cap dielectric is formed. The layer of amorphous silicon is then confined by at least one spacer, which is deposited under a low temperature process. Once the at least one spacer is in place, the amorphous silicon is exposed to a temperature sufficiently high to convert the amorphous silicon to polysilicon. By waiting until the amorphous silicon is confined within the at least one spacer before converting it to polysilicon, the variation in gate length is reduced.Type: GrantFiled: November 4, 2003Date of Patent: April 26, 2005Assignee: International Business Machines CorporationInventors: Karanam Balasubramanyam, Serge Biesemans, Byeongju Park
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Patent number: 6605521Abstract: In order to prevent abnormal oxidation of the side wall of a polycide gate conductor layer in the oxidation heat treatment process after the RIE processing of the polycide gate conductor layer in a semiconductor memory cell, the heat treatment for oxidizing the side wall of the polycide gate conductor layer is conducted in two steps with different conditions. By conducting the first heat treatment process in an inert atmosphere, a thin oxide film is formed on the side wall of the polycide tungsten/gate conductor layer. Then by conducting the second heat treatment process in an atmosphere with a strong oxidizing property, a thick oxide film without abnormal oxidation can be formed.Type: GrantFiled: October 8, 2002Date of Patent: August 12, 2003Assignees: Kabushiki Kaisha Toshiba, International Business Machines CorporationInventors: Atul C. Ajmera, Karanam Balasubramanyam, Tomio Katata, Shang-Bin Ko
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Publication number: 20030036253Abstract: In order to prevent abnormal oxidation of the side wall of a polycide gate conductor layer in the oxidation heat treatment process after the RIE processing of the polycide gate conductor layer in a semiconductor memory cell, the heat treatment for oxidizing the side wall of the polycide gate conductor layer is conducted in two steps with different conditions. By conducting the first heat treatment process in an inert atmosphere, a thin oxide film is formed on the side wall of the polycide tungsten/gate conductor layer. Then by conducting the second heat treatment process in an atmosphere with a strong oxidizing property, a thick oxide film without abnormal oxidation can be formed.Type: ApplicationFiled: October 8, 2002Publication date: February 20, 2003Applicant: Kabushiki Kaisha ToshibaInventors: Atul C. Ajmera, Karanam Balasubramanyam, Tomio Katata, Shang-Bin Ko
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Patent number: 6395296Abstract: The present invention is directed to a new soluble double metal salt of group IA and IIA of (−) hydroxycitric acid of general formula I: where X is IA group metal: Li or Na or K or Rb or Cs or Fr where Y is IIA group metal: Be or Mg or Ca or Sr or Ba or Ra where the concentration of X in the salt varies from 1.5-51.0%, the concentration of Y in the salts varies from 2.0-50.9%, the concentration of HCA in the salt varies from 31.0-93.0% depending on the nature of X and Y. This invention more particularly relates to new soluble double metal salt of group IA and IIA of (−) hydroxycitric acid of general formula II.Type: GrantFiled: August 11, 2000Date of Patent: May 28, 2002Inventors: Karanam Balasubramanyam, Bhaskaran Chandrasekhar, Candadai Seshadri Ramadoss, Pillarisetti Venkata Subba Rao
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Patent number: 6160172Abstract: The present invention is directed to a new soluble double metal salt of group IA and IIA of (-) hydroxycitric acid of general formula I:where X is IA group metal: Li or Na or K or Rb or Cs or Frwhere Y is IIA group metal: Be or Mg or Ca or Sr or Ba or Rawhere the concentration of X in the salt varies from 1.5-51.0%,the concentration of Y in the salts varies from 2.0-50.9%,the concentration of HCA in the salt varies from 31.0-93.0% depending on the nature of X and Y.This invention more particularly relates to new soluble double metal salt of group IA and IIA of (-) hydroxycitric acid of general formula II.Type: GrantFiled: April 14, 1998Date of Patent: December 12, 2000Assignee: Vittal Mallya Scientific Research FoundationInventors: Karanam Balasubramanyam, Bhaskaran Chandrasekhar, Candadai Seshadri Ramadoss, Pillarisetti Venkata Subba Rao
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Controlled dopant diffusion and metal contamination in thin polycide gate conductor of MOSFET device
Patent number: 6114736Abstract: A MOSFET device is formed on a P- doped semiconductor substrate with an N- well formed therein, with a pair of isolation regions formed in the N- well with a gate oxide layer formed above the N- well. An FET device is formed with source and drain regions within the N-well, and a gate electrode formed above the gate oxide layer aligned with the source and drain regions. The gate electrode comprises a stack of layers. A polysilicon layer is formed on the gate oxide layer. A tungsten nitride dopant barrier layer is formed upon the polysilicon layer having a thickness of from about 5 nm to about 20 nm, and a tungsten silicide layer is formed upon the tungsten nitride layer.Type: GrantFiled: July 12, 1999Date of Patent: September 5, 2000Assignee: International Business Machines CorporationInventors: Karanam Balasubramanyam, Stephen Bruce Brodsky, Richard Anthony Conti, Badih El-Kareh -
Patent number: 6090671Abstract: Reduction of gate-induced-drain-leakage in metal oxide semiconductor (MOS) devices is achieved by performing an anneal in a non-oxidizing ambient. In one embodiment, the anneal is performed in a argon and/or ammonia ambients after gate sidewall oxidation that forms the spacers.Type: GrantFiled: September 30, 1997Date of Patent: July 18, 2000Assignees: Siemens Aktiengesellschaft, International Business Machines CorporationInventors: Karanam Balasubramanyam, Martin Gall, Jeffrey P. Gambino, Jack A. Mandelman
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Patent number: 5923999Abstract: A MOSFET device is formed on a P- doped semiconductor substrate with an N- well formed therein, with a pair of isolation regions formed in the N- well with a gate oxide layer formed above the N- well. An FET device is formed with source and drain regions within the N-well, and a gate electrode formed above the gate oxide layer aligned with the source and drain regions. The gate electrode comprises a stack of layers. A polysilicon layer is formed on the gate oxide layer. A tungsten nitride dopant barrier layer is formed upon the polysilicon layer having a thickness of from about 5 nm to about 20 nm, and a tungsten silicide layer is formed upon the tungsten nitride layer.Type: GrantFiled: October 29, 1996Date of Patent: July 13, 1999Assignee: International Business Machines CorporationInventors: Karanam Balasubramanyam, Stephen Bruce Brodsky, Richard Anthony Conti, Badih El-Kareh
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Patent number: 4808545Abstract: Disclosed is a process fo fabrication of a MESFET in which starting with a GaAs substrate having a shallow N- layer covered with nitride, a submicron-wide dummy gate mask consisting of upper and lower portions made of dissimilar materials is formed. Multilayer organic and sidewall image transfer techniques are employed for forming the mask. The nitride is etched using the gate mask. N+ source/drain are formed by ion implantation. The lower portion of the gate mask is etched to expose the periphery of the nitride. Refractory metal for source/drain contacts is deposited. An oxide laeyr is deposited to passivate the source/drain contacts and to fully cover the exposed nitride periphery. The gate mask is removed. High temperature anneal is accomplished to simultaneously activate the N+ regions and anneal the contact metal. By RIE the exposed nitride removed leaving submicron spacers thereof. Gate metal is deposited in the gate region.Type: GrantFiled: April 20, 1987Date of Patent: February 28, 1989Assignee: International Business Machines CorporationInventors: Karanam Balasubramanyam, Robert R. Joseph, Robert B. Renbeck
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Patent number: 4689113Abstract: Disclosed is a process of forming high density, planar, single- or multi-level wiring for a semiconductor integrated circuit chip. On the chip surface is provided a dual layer of an insulator and hardened photoresist having various sized openings (grooves for wiring and openings for contacts) therein in a pattern of the desired wiring. A conductive (e.g., metal) layer of a thickness equal to that of the insulator is deposited filling the grooves and contact openings. A sacrificial dual (lower and upper component) layer of (hardened) photoresist is formed filling the metal valleys and obtaining a substantially planar surface. The lower component layer is thin and conformal and has a higher etch rate than the upper component layer which is thick and nonconformal. By reactive ion etching the sacrificial layer is removed leaving resist plugs in the metal valleys.Type: GrantFiled: March 21, 1986Date of Patent: August 25, 1987Assignee: International Business Machines CorporationInventors: Karanam Balasubramanyam, Anthony J. Dally, Jacob Riseman, Seiki Ogura
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Patent number: 4405710Abstract: This invention relates to thin (g-Ge.sub.x -Se.sub.1--x) positive ionresists and thin (g-Ge.sub.x -Se.sub.1--x) with absorbed or chemically bonded silver as a negative ionresist, which when exposed to H.sup.+ ion beams and subsequently developed, for example by alkaline solutions, have a useful differential dissolution rate, when comparing exposed and unexposed areas, with excellent resolution. The ionresist materials and processes of the invention are useful, for example, in forming solid-state electronic articles.Type: GrantFiled: June 22, 1981Date of Patent: September 20, 1983Assignee: Cornell Research Foundation, Inc.Inventors: Karanam Balasubramanyam, Arthur L. Ruoff