Patents by Inventor Reddy Vangala
Reddy Vangala 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).
-
Patent number: 8823470Abstract: A structure and method for adjusting the bandwidth of a ceramic waveguide filter comprising, in one embodiment, a monoblock of dielectric ceramic material defining respective steps and respective input/output through-holes extending through the monoblock and the respective steps. In one embodiment, the steps are defined by notches in the monoblock and the input/output through-holes define openings terminating in the notch. The bandwidth of the ceramic waveguide filter may be adjusted by adjusting the height/thickness and direction of the steps relative to an exterior surface of the monoblock and/or the diameter of the input/output through-holes.Type: GrantFiled: May 9, 2011Date of Patent: September 2, 2014Assignee: CTS CorporationInventor: Reddy Vangala
-
Publication number: 20140128607Abstract: There is provided salts and polymorphs of sitagliptin, processes for the preparation thereof, and pharmaceutical compositions comprising the same.Type: ApplicationFiled: December 5, 2013Publication date: May 8, 2014Applicants: Dr. Reddy's Laboratories, Inc., Dr. Reddy's Laboratories LimitedInventors: Pratap Reddy Padi, Babu Ireni, Srinivas Polavarapu, Shailaja Padamata, Kavitha Nerella, Vijaya Anand Ramasamy, Ranga Reddy Vangala
-
Publication number: 20140077900Abstract: A dielectric waveguide filter comprising a block of dielectric material covered with an exterior layer of conductive material. A plurality of stacked resonators are defined in the block of dielectric material by one or more slots in the block of dielectric material and an interior layer of conductive material that separates the stacked resonators. First and second RF signal transmission windows in the interior layer of conductive material provide for both direct and cross-coupling RF signal transmission between the stacked resonators. In one embodiment, the waveguide filter is comprised of separate blocks of dielectric material each covered with an exterior layer of conductive material, each including one or more slots defining a plurality of resonators, and coupled together in a stacked relationship.Type: ApplicationFiled: November 25, 2013Publication date: March 20, 2014Applicant: CTS CORPORATIONInventors: Alexandre Rogozine, Reddy Vangala
-
Publication number: 20120293283Abstract: A method of tuning the frequency of a waveguide filter including the step of removing dielectric material from one or both of the first and second opposed exterior side surfaces of the waveguide filter to cause a change in the center frequency of the waveguide filter. In one embodiment, dielectric material is removed from one or both of the first and second opposed exterior side surfaces of the waveguide filter in unequal amounts wherein the tuned waveguide filter includes first and second slits defined in the respective first and second opposed exterior side surfaces which extend unequal first and second distances into the body of the waveguide filter.Type: ApplicationFiled: August 2, 2012Publication date: November 22, 2012Applicant: CTS CORPORATIONInventor: Reddy Vangala
-
Publication number: 20120286901Abstract: A dielectric waveguide filter comprising a block of dielectric material including a plurality of resonators defined by a plurality of slots defined in the block of dielectric material. The resonators are arranged on the block of dielectric material in one or more rows and columns. First and second RF signal input/output electrodes are defined on the block of dielectric material. A first direct RF signal transmission path for the transmission of an RF signal is defined by the first and second RF signal input/output electrodes and the plurality of resonators. In one embodiment, internal windows define a first direct RF signal transmission means and additional RF signal transmission means define alternate or cross-coupling paths for the transmission of the RF signal from resonators in one column to resonators in another column. In one embodiment, the filter is comprised of two separate blocks of dielectric material which have been coupled together.Type: ApplicationFiled: December 3, 2011Publication date: November 15, 2012Inventor: Reddy Vangala
-
Patent number: 8309724Abstract: There is provided an improved process for the preparation of Sitagliptin of Formula II by reduction of compound of Formula VIII to Formula IX followed by deprotection of Formula IX to afford Sitagliptin of Formula II.Type: GrantFiled: December 18, 2008Date of Patent: November 13, 2012Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, IncorporatedInventors: Pratap Reddy Padi, Babu Ireni, Srinivas Polavarapu, Shailaja Padamata, Kavitha Nerella, Vijaya Anand Ramasamy, Ranga Reddy Vangala
-
Patent number: 8174340Abstract: A ceramic monoblock filter including a direct signal path defined by at least four spaced-apart through-hole resonators in combination with ground bars extending between the through-hole resonators and a separate quadruplet cross-coupling alternate signal path defined by two conductive pads located adjacent the first and fourth ones of the through-hole resonators respectively and a separate external bridge member which interconnects and couples the two pads. The bridge member is preferably made of a material having a lower dielectric constant than the block of the filter. In one embodiment, the filter is a monoblock duplexer filter comprising respective transmit and receive sections each including at least four of the through-hole resonators, the ground bars, the two pads, and the bridge member. In the duplexer embodiment, additional through-hole resonators may define shunt zeros.Type: GrantFiled: May 4, 2010Date of Patent: May 8, 2012Assignee: CTS CorporationInventors: Reddy Vangala, Tri Dinh
-
Publication number: 20110279200Abstract: A structure and method for adjusting the bandwidth of a ceramic waveguide filter comprising, in one embodiment, a monoblock of dielectric ceramic material defining respective steps and respective input/output through-holes extending through the monoblock and the respective steps. In one embodiment, the steps are defined by notches in the monoblock and the input/output through-holes define openings terminating in the notch. The bandwidth of the ceramic waveguide filter may be adjusted by adjusting the height/thickness and direction of the steps relative to an exterior surface of the monoblock and/or the diameter of the input/output through-holes.Type: ApplicationFiled: May 9, 2011Publication date: November 17, 2011Inventor: Reddy Vangala
-
Publication number: 20100289599Abstract: An RF module for use in an RF signal transceiver system. In one embodiment, the RF module comprises a substrate having at least a duplexer filter, first and second bandpass filters and first and second low noise amplifiers mounted thereon. The substrate includes respective edges having respective RF signal input/output and supply voltage terminals defined therein. The overall dimensions of the substrate and/or the location of the respective terminals have been predetermined in a manner which allows the same size substrate with the same terminal locations to be used for several different air interfaces such as, for example, EGSM, GSM 850, DCS, and PCS applications, irrespective of a specific air interface need for differently sized and/or additional filters.Type: ApplicationFiled: May 12, 2010Publication date: November 18, 2010Inventors: Thomas Knecht, Glen Reeser, Reddy Vangala
-
Publication number: 20100274017Abstract: There is provided salts and polymorphs of sitagliptin, processes for the preparation thereof, and pharmaceutical compositions comprising the same.Type: ApplicationFiled: December 18, 2008Publication date: October 28, 2010Applicants: DR. REDDY'S LABORATORIES LTD., DR. REDDY'S LABORATORIES, INC.Inventors: Pratap Reddy Padi, Babu Ireni, Srinivas Polavarapu, Shailaja Padamata, Kavitha Nerella, Vijaya Anand Ramasamy, Ranga Reddy Vangala
-
Publication number: 20100231323Abstract: A ceramic monoblock filter including a direct signal path defined by at least four spaced-apart through-hole resonators in combination with ground bars extending between the through-hole resonators and a separate quadruplet cross-coupling alternate signal path defined by two conductive pads located adjacent the first and fourth ones of the through-hole resonators respectively and a separate external bridge member which interconnects and couples the two pads. The bridge member is preferably made of a material having a lower dielectric constant than the block of the filter. In one embodiment, the filter is a monoblock duplexer filter comprising respective transmit and receive sections each including at least four of the through-hole resonators, the ground bars, the two pads, and the bridge member. In the duplexer embodiment, additional through-hole resonators may define shunt zeros.Type: ApplicationFiled: May 4, 2010Publication date: September 16, 2010Inventors: Reddy Vangala, Tri Dinh
-
Patent number: 7724109Abstract: A ball grid array ceramic filter including a substrate having a ground layer of conductive material disposed over one of the surfaces thereof and a plurality of strips of conductive material on the other of the substrate surfaces defining resonators adapted to receive and pass RF signals. A plurality of vias extend through the substrate and define opposed ends terminating in the respective substrate surfaces. In one embodiment, a plurality of conductive spheres defining respective ground and RF signal input/output pads are disposed on the substrate surface with the ground layer thereon. Certain of the vias couple the resonators to the ground layer while others of the vias couple the resonators to respective spheres adapted for coupling to the respective RF signal input/output contacts on the top surface of a printed circuit board to which the filter is adapted to be direct surface mounted.Type: GrantFiled: November 13, 2006Date of Patent: May 25, 2010Assignee: CTS CorporationInventors: Thomas A. Knecht, Glen Reeser, Reddy Vangala, Damon Niswonger
-
Patent number: 7714680Abstract: A ceramic monoblock filter including a direct signal path defined by at least four spaced-apart through-hole resonators in combination with ground bars extending between the through-hole resonators and a separate quadruplet cross-coupling alternate signal path defined by two conductive pads located adjacent the first and fourth ones of the through-hole resonators respectively and a separate external bridge member which interconnects and couples the two pads. The bridge member is preferably made of a material having a lower dielectric constant than the block of the filter. In one embodiment, the filter is a monoblock duplexer filter comprising respective transmit and receive sections each including at least four of the through-hole resonators, the ground bars, the two pads, and the bridge member. In the duplexer embodiment, additional through-hole resonators may define shunt zeros.Type: GrantFiled: May 15, 2007Date of Patent: May 11, 2010Assignee: CTS CorporationInventors: Reddy Vangala, Tri Dinh
-
Patent number: 7321278Abstract: A low profile ceramic filter for connection to an antenna, a transmitter and a receiver. The filter filters an incoming signal from the antenna to the receiver and an outgoing signal from the transmitter to the antenna. The filter has a ceramic core with through-holes that extend between sides of the core. The through-holes form coupled resonators and trap resonators. Two trap resonators are located at ends of the block, and two of the trap resonators are located in a central portion of the block. The coupled resonators are located between the end trap resonators and the trap resonators in the central portion. The trap resonators have a resonant frequency that is outside of the desired passband such that trap zeros or poles are provided.Type: GrantFiled: April 7, 2004Date of Patent: January 22, 2008Assignee: CTS CorporationInventor: Reddy Vangala
-
Publication number: 20070279150Abstract: A ceramic monoblock filter including a direct signal path defined by at least four spaced-apart through-hole resonators in combination with ground bars extending between the through-hole resonators and a separate quadruplet cross-coupling alternate signal path defined by two conductive pads located adjacent the first and fourth ones of the through-hole resonators respectively and a separate external bridge member which interconnects and couples the two pads. The bridge member is preferably made of a material having a lower dielectric constant than the block of the filter. In one embodiment, the filter is a monoblock duplexer filter comprising respective transmit and receive sections each including at least four of the through-hole resonators, the ground bars, the two pads, and the bridge member. In the duplexer embodiment, additional through-hole resonators may define shunt zeros.Type: ApplicationFiled: May 15, 2007Publication date: December 6, 2007Inventors: Reddy Vangala, Tri Dinh
-
Publication number: 20070109076Abstract: A ball grid array ceramic filter including a substrate having a ground layer of conductive material disposed over one of the surfaces thereof and a plurality of strips of conductive material on the other of the substrate surfaces defining resonators adapted to receive and pass RF signals. A plurality of vias extend through the substrate and define opposed ends terminating in the respective substrate surfaces. In one embodiment, a plurality of conductive spheres defining respective ground and RF signal input/output pads are disposed on the substrate surface with the ground layer thereon. Certain of the vias couple the resonators to the ground layer while others of the vias couple the resonators to respective spheres adapted for coupling to the respective RF signal input/output contacts on the top surface of a printed circuit board to which the filter is adapted to be direct surface mounted.Type: ApplicationFiled: November 13, 2006Publication date: May 17, 2007Inventors: Thomas Knecht, Glen Reeser, Reddy Vangala, Damon Niswonger
-
Patent number: 7171237Abstract: An embodiment of the invention is a modular card style radio-signal modem suitable for wireless data communication to a personal computer. The modem comprises a main circuit board substrate defining an opening, a card-to-computer connection interface operably linked to the circuit board, a radio transceiver on the circuit board in communication with the connection interface. The radio transceiver has a receiver input and a transmitter output. The card modem also includes a dielectric block antenna duplexer attached to the circuit board and suspended in the opening, the duplexer having a transmit signal input in electric communication with the transmitter output, a receive signal output in electric communication with the receiver input and an antenna connection electrode.Type: GrantFiled: May 31, 2002Date of Patent: January 30, 2007Assignee: CTS CorporationInventor: Reddy Vangala
-
Publication number: 20060192634Abstract: A low profile ceramic filter for connection to an antenna, a transmitter and a receiver. The filter filters an incoming signal from the antenna to the receiver and an outgoing signal from the transmitter to the antenna. The filter has a ceramic core with through-holes that extend between sides of the core. The through-holes form coupled resonators and trap resonators. Two trap resonators are located at ends of the block, and two of the trap resonators are located in a central portion of the block. The coupled resonators are located between the end trap resonators and the trap resonators in the central portion. The trap resonators have a resonant frequency that is outside of the desired passband such that trap zeros or poles are provided.Type: ApplicationFiled: April 7, 2004Publication date: August 31, 2006Inventor: Reddy Vangala
-
Patent number: 6879222Abstract: A duplexing communication signal filter has a substantially U-shaped core of dielectric material including a transmit arm, a receive arm and a base portion joining the transmit arm to the receive arm. Both the transmit arm and the receive arm each define a series of through-hole resonators. Present on the core of dielectric material is a surface-layer pattern of metallized and unmetallized areas. The pattern includes a wide area of metallization for providing off-band signal absorption, a first unmetallized area surrounding a plurality of the through-hole openings of the transmit arm, a second contiguous unmetallized area surrounding a plurality of the through-hole openings of the receiver arm, a transmitter pad metallized area on the transmit arm, a receiver pad metallized area on the receive arm, and an antenna pad metallized area.Type: GrantFiled: February 14, 2002Date of Patent: April 12, 2005Assignee: CTS CorporationInventors: Reddy Vangala, Glenn Rice
-
Publication number: 20030201844Abstract: The present invention is a preferred monoblock ceramic bandpass duplexer filter. The preferred filter has at least three I/O pads. One of the pads is coupled to an antenna, another is connected to a transmission circuit and the last pad is connected to a receive circuit. The filter is comprised of two sections: a transmission section and a receive section. The transmission and receive sections include resonators disposed on respective sides of the antenna pad. A first alternative signal path is disposed adjacent the ends of the transmission resonators. A second alternative signal path is disposed adjacent to the ends of the receive resonators. Each alternative signal path couples adjacent and non-adjacent resonators. A further feature of the filter of the present invention includes a shunt zero resonator for the transmission section. To the contrary, the present invention allows the elimination of a shunt zero resonator for the receive section of the filter.Type: ApplicationFiled: April 23, 2003Publication date: October 30, 2003Inventors: Truc Hoang, Reddy Vangala