Patents by Inventor Ramachandran Ranganathan
Ramachandran Ranganathan 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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Publication number: 20160037386Abstract: Techniques are described for controlling the data rate of individual or groups of client devices in a network such as a Wireless Local Area Network (WLAN). In one aspect, a method may include grouping a plurality of client devices into at least one group, the grouping being unassociated with a traffic class of the plurality of client devices. The method may also include determining channel characteristic thresholds, such as one or more of a bandwidth threshold, message size threshold, throughput threshold, or an optional service requirement, for the at least one group of client devices, and controlling a data rate for the at least one group of client devices based at least in part on the determined channel characteristic thresholds. In some aspects, different channel characteristic thresholds may be applied to uplink and/or downlink communications with the client device.Type: ApplicationFiled: July 30, 2014Publication date: February 4, 2016Inventors: Vijayaraja Pitchaiah, Ramachandran Ranganathan, Bala Shanmugam Shanmugam Kamatchi
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Publication number: 20150372709Abstract: A wireless device operates as both a station and one or more access points. In the wireless device, a scan window of a specified duration is requested to start at a first time, to scan for access points external to the wireless device in accordance with operation of the wireless device as a station. It is determined that a beacon scheduled for transmission or reception at a second time conflicts with the requested scan window. In response, the beacon is transmitted or received at the second time and at least a portion of the scan window is delayed until after the beacon has been transmitted or received.Type: ApplicationFiled: June 24, 2014Publication date: December 24, 2015Inventors: Ramachandran Ranganathan, Srinivasan Ganapathy, Suresh Kumar Nethirananthan, Manikandan Radhakrishnan, Vijayaraja Pitchaiah
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Publication number: 20140254565Abstract: Systems and methods are provided for enhancing the concurrency of a wireless device operating in multiple network contexts. At least one virtual interface may be implemented for each network context. A recurring communication event having a defined interval associated with one of the network contexts may be identified and the interval may be time divided into multiple operation periods, such that each operation period corresponds to one of the virtual interfaces. Accordingly, each virtual interface may be given access to the physical transceiver during the corresponding operation period. As desired, the operation periods may be subdivided into one or more slots, which may be associated with different priorities of communication.Type: ApplicationFiled: July 2, 2013Publication date: September 11, 2014Applicant: QUALCOMM INCORPORATEDInventors: Vijayaraja Pitchaiah, Srinivasan Ganapathy, Ramachandran Ranganathan
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Publication number: 20120258043Abstract: Disclosed herein is a class of linkable tetrasaccharide compounds that includes the amino phenyl glycoside of sialyl Lewis X (SLeX) and related analogs. These compounds have conjugatable nucleophilic groups, making them useful in preparing multimeric SLeX compositions. In particular, the disclosed SLeX compounds can be used to prepare selectin binding ligand conjugates by linking them to a reporter moiety, such as a contrast agent, a radiodiagnostic agent, or a cytotoxic or chemotherapeutic agent. The SLeX compounds and conjugates of the invention exhibit binding to selectin that is similar to native Sialyl LeX, and are, therefore, useful for diagnosing and treating selectin-mediated disorders and related conditions.Type: ApplicationFiled: April 26, 2012Publication date: October 11, 2012Applicant: BRACCO SUISSE S.A.Inventors: Ramachandran RANGANATHAN, Kondareddiar RAMALINGAM, Radhakrishna PILLAI, Edmund R. MARINELLI, Rolf E. SWENSON
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Publication number: 20110229409Abstract: Disclosed herein is a class of linkable tetrasaccharide compounds that includes the amino phenyl glycoside of sialyl Lewis X (SLeX) and related analogs. These compounds have conjugatable nucleophilic groups, making them useful in preparing multimeric SLeX compositions. In particular, the disclosed SLeX compounds can be used to prepare selectin binding ligand con-jugatcs by linking them to a reporter moiety, such as a contrast agent, a radiodiagnostic agent, or a cytotoxic or chemotherapeutic agent. The SLeX compounds and conjugates of the invention exhibit binding to selectin that is similar to native Sialyl LeX, and are, therefore, useful for diagnosing and treating selectin-mediated disorders and related conditions.Type: ApplicationFiled: May 26, 2011Publication date: September 22, 2011Applicant: Bracco International B.V.Inventors: Ramachandran Ranganathan, Kondareddiar Ramalingam, Radhakrishna Pillai, Edmund R. Marinelli, Rolf E. Swenson
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Publication number: 20080300220Abstract: Disclosed herein is a class of linkable tetrasaccharide compounds that includes the amino phenyl glycoside of sialyl Lewis X (SLeX) and related analogs. These compounds have conjugatable nucleophilic groups, making them useful in preparing multimeric SLeX compositions. In particular, the disclosed SLeX compounds can be used to prepare selectin binding ligand conjugates by linking them to a reporter moiety, such as a contrast agent, a radiodiagnostic agent, or a cytotoxic or chemotherapeutic agent. The SLeX compounds and conjugates of the invention exhibit binding to selectin that is similar to native Sialyl LeX, and are, therefore, useful for diagnosing and treating selectin-mediated disorders and related conditions.Type: ApplicationFiled: August 13, 2008Publication date: December 4, 2008Applicant: BRACCO INTERNATIONAL B.V.Inventors: Ramachandran Ranganathan, Kondareddiar Ramalingam, Radhakrishna Pillai, Edmund R. Marinelli, Rolf E. Swenson
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Patent number: 7422733Abstract: Disclosed herein is a class of linkable tetrasaccharide compounds that includes the amino phenyl glycoside of sialyl Lewis X (SLeX) and related analogs. These compounds have conjugatable nucleophilic groups, making them useful in preparing multimeric SLeX compositions. In particular, the disclosed SLeX compounds can be used to prepare selectin binding ligand conjugates by linking them to a reporter moiety, such as a contrast agent, a radiodiagnostic agent, or a cytotoxic or chemotherapeutic agent. The SLeX compounds and conjugates of the invention exhibit binding to selectin that is similar to native Sialyl Lex, and are, therefore, useful for diagnosing and treating selectin-mediated disorders and related conditions.Type: GrantFiled: November 29, 2001Date of Patent: September 9, 2008Assignee: Bracco International B.V.Inventors: Ramachandran Ranganathan, Kondareddiar Ramalingam, Radhakrishua Pillai, Edmund E. Marinelli, Rolf E. Swenson
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Publication number: 20070086944Abstract: The invention provides radiopharmaceuticals for diagnostic and therapeutic applications, conjugates of antioxidants with metal chelating ligands, intermediate compounds, methods of making such radiopharmaceuticals, ligands, and intermediate compounds, and kits for preparing the radiopharmaceutical complexes.Type: ApplicationFiled: November 20, 2006Publication date: April 19, 2007Applicant: BRACCO INTERNATIONAL B.V.Inventors: Ramachandran Ranganathan, Hong Fan, Michael Tweedle, Rolf Swenson
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Publication number: 20070077197Abstract: Diagnostic and therapeutic compositions in the form of complexes for enhancing transmembrane transport of a diagnostic or therapeutic agent and methods for their use. The complexes contain the ?, ?, or bis isomers of folate receptor-binding analogs of folate, a metal chelated by a ligand, and in one embodiment, a chemotherapeutic agent.Type: ApplicationFiled: September 25, 2006Publication date: April 5, 2007Applicant: Bracco International B.V.Inventors: Paul Wedeking, Ruth Wager, Thangavel Arunachalam, Kondareddiar Ramalingam, Karen Linder, Ramachandran Ranganathan, Adrian Nunn, Nataranjan Raju, Michael Tweedle
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Publication number: 20050090689Abstract: Novel metal-chelate complexes comprising aminocarboxylate ligands including substituted aromatic amide moieties, such as those having the formula wherein R13, A1, R1 and R2 are as defined herein, are disclosed.Type: ApplicationFiled: October 13, 2004Publication date: April 28, 2005Applicant: Bracco International B.V.Inventors: Radhakrishna Pillai, Sang Kang, Edmund Marinelli, Ramachandran Ranganathan, Michael Tweedle
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Publication number: 20040097403Abstract: Disclosed herein is a class of linkable tetrasaccharide compounds that includes the amino phenyl glycoside of sialyl Lewis X (SLeX) and related analogs. These compounds have conjugatable nucleophilic groups, making them useful in preparing multimeric SLeX compositions. In particular, the disclosed SLeX compounds can be used to prepare selectin binding ligand conjugates by linking them to a reporter moiety, such as a contrast agent, a radiodiagnostic agent, or a cytotoxic or chemotherapeutic agent. The SLeX compounds and conjugates of the invention exhibit binding to selectin that is similar to native Sialyl Lex, and are, therefore, useful for diagnosing and treating selectin-mediated disorders and related conditions.Type: ApplicationFiled: November 17, 2003Publication date: May 20, 2004Inventors: Ramachandran Ranganathan, Kondareddiar Ramalingam, Radhakrishua Pillai, Edmund E. Marinelli, Rolf E. Swenson
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Patent number: 5278311Abstract: Novel nonionic contrast agents of the formula ##STR1## or dimers of the formula ##STR2## are disclosed where X, Z and R.sub.1 -R.sub.5 are as defined herein.Type: GrantFiled: June 5, 1992Date of Patent: January 11, 1994Assignee: E. R. Squibb & Sons, Inc.Inventors: Thangavel Arunachalam, Ramachandran Ranganathan
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Patent number: 5191119Abstract: Methods are provided for substituting aromatic carboxylic acids and derivatives thereof and amino substituted aromatic carboxylic acids and derivatives thereof, by forming imides and imide-amides, respectively, by acylation with aliphatic carboxylic acids, substituting at least one nitrogen atom under mild basic conditions with an aliphatic compound having as alkylating agent a displaceable functionality and removing undesired acyl groups, as appropriate.Type: GrantFiled: July 5, 1990Date of Patent: March 2, 1993Assignee: Cook Imaging Corp.Inventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 5035877Abstract: Novel non-ionic contrast media are efficiently prepared from generally available ionic contrast media. Particularly, polyhydroxyhalohydrocarbons are employed with a triiodo-substituted acylamido benzoic acids in aqueous weakly basic media to selectively substitute the amido nitrogen, followed by activation of the carboxyl group for amide formation.Type: GrantFiled: September 14, 1990Date of Patent: July 30, 1991Assignee: Cook Imaging CorporationInventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 4954348Abstract: Novel non-ionic contrast media of a hitherto unknown combination of low osmolality and low viscosity are efficiently prepared from generally available ionic contrast media or non-iodinated precursors. Particularly, polyhydroxyhalo-hydrocarbons are employed with a triiodo-substituted acylamido benzoic acids in aqueous weakly basic media to selectively substitute the amido nitrogen, followed by activation of the carboxyl group for amide formation.Type: GrantFiled: July 1, 1988Date of Patent: September 4, 1990Assignee: Cook Imaging CorporationInventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 4584401Abstract: Methods and compositions are provided for preparing polyhydroxylated polyiodo non-ionic contrast media. Particularly, substituted polyiodobenzamides are prepared, wherein the benzamide nitrogen is polyhydroxylated by allylic substitution on the nitrogen and oxidation of the olefinic group to provide for polyhydroxyl substitution. Amino substituents on the benzamide may be polyhydroxylated by allyl substitution or acryl substitution. All of the olefins may be oxidized simultaneously to glycols to provide for water soluble relatively non-toxic contrast media in efficient economical processes. Alternatively, the same compounds can be synthesized by alkylating N-acylbenzamide with polyacetoxyalkyl or dioxolanylalkyl halides, followed by removal of the protective groups.Type: GrantFiled: October 20, 1983Date of Patent: April 22, 1986Assignee: Biophysica FoundationInventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 4439613Abstract: Novel intermediates for non-ionic polyiodo amino-substituted benzenepolyamides having polyol substituents on the amide nitrogens are provided which are 5-amino-6-hydroxy-1,3-dioxepanes. The compounds provide an economic and efficient route to novel contrast media having excellent chemical and physiological properties.Also provided are methods for preparing the subject compounds.Type: GrantFiled: April 5, 1982Date of Patent: March 27, 1984Assignee: The Regents of the University of CaliforniaInventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 4389526Abstract: Novel methods are provided for synthesizing 2-amino-2-tetritol, by positive halogen addition to protected 1,4-dioxybutene-2 in the presence of a nitrile, resulting in addition of a halo functionality and the nitrile functionality across the double bond. Upon hydrolysis, the desired erythro-product can be obtained in stereochemically good yield.Type: GrantFiled: August 3, 1981Date of Patent: June 21, 1983Assignee: The Regents of the University of CaliforniaInventors: Milos Sovak, Ramachandran Ranganathan
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Patent number: 4341756Abstract: Novel intermediates for non-ionic polyiodo amino-substituted benzenepolyamides having polyol substituents on the amide nitrogens are provided which are 5-amino-6-hydroxy-1,3-dioxepanes. The compounds provide an economic and efficient route to novel contrast media having excellent chemical and physiological properties.Also provided are methods for preparing the subject compounds.Type: GrantFiled: April 17, 1980Date of Patent: July 27, 1982Assignee: The Regents of the University of CaliforniaInventors: Milos Sovak, Ramachandran Ranganathan