Patents by Inventor Rajiv K. Singh
Rajiv K. Singh 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: 9878420Abstract: A CMP method uses a slurry including colloidal metal oxide or colloidal semiconductor oxide particles (colloidal particles) in water. At least one particle feature is selected from (i) the colloidal particles having a polydispersity >30%, and (ii) mixed particle types including the colloidal particles having an average primary size >50 nm mixed with fumed oxide particles having average primary size <25 nm. A substrate having an alumina surface is placed into a CMP apparatus, and CMP is performed with a rotating polishing pad and the slurry to polish the alumina surface. The polydispersity is determined by a polydispersity formula for a distribution width (w) involving width w1 and width w2 at a second larger particle size. The polydispersity formula=(w2?w1)×100/dav which includes 63% of a total of the colloidal particles by volume and day is an average particle size of the colloidal particles.Type: GrantFiled: November 2, 2016Date of Patent: January 30, 2018Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Kannan Balasundaram, Arul Chakkaravarthi Arjunan, Deepika Singh, Wei Bai
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Publication number: 20170118092Abstract: Aspects of the present disclosure include an adaptive notification and ticketing system for a telecommunications network. The system includes a computing device and a plurality of network devices associated with the telecommunications network. Data is generated about a plurality of past network events associated with the plurality of network devices. The computing device is utilized to generate a model from the data. The model may be used to interpret new network events and generate an output indicative of a service impact event. The new network events are applied to the model using the computing device to generate the output indicative of a service impact event. The computing device generates a responsive action from the output indicative of a service impact event. The service impact event is a network event that disrupts a network service associated with the telecommunications network.Type: ApplicationFiled: October 24, 2016Publication date: April 27, 2017Applicant: Level 3 Communications, LLCInventors: Allen E. Dixon, Sharna Aeckerle, Paul Farnsworth, Rene Grippo, Eric D. Gundersen, Sanjiv Kumar, Rick D. Lind, Matthew R. Moore, Luke P. Philips, Rajiv K. Singh, Raymond L. Smith, David L. Stozki
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Publication number: 20170072530Abstract: A CMP method uses a slurry including colloidal metal oxide or colloidal semiconductor oxide particles (colloidal particles) in water. At least one particle feature is selected from (i) the colloidal particles having a polydispersity >30%, and (ii) mixed particle types including the colloidal particles having an average primary size >50 nm mixed with fumed oxide particles having average primary size <25 nm. A substrate having an alumina surface is placed into a CMP apparatus, and CMP is performed with a rotating polishing pad and the slurry to polish the alumina surface. The polydispersity is determined by a polydispersity formula for a distribution width (w) involving width w1 and width w2 at a second larger particle size. The polydispersity formula=(w2?w1)×100/dav which includes 63% of a total of the colloidal particles by volume and day is an average particle size of the colloidal particles.Type: ApplicationFiled: November 2, 2016Publication date: March 16, 2017Inventors: RAJIV K. SINGH, KANNAN BALASUNDARAM, ARUL CHAKKARAVARTHI ARJUNAN, DEEPIKA SINGH, WEI BAI
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Patent number: 9567492Abstract: A chemical mechanical polishing (CMP) includes providing a slurry including composite particles dispersed in a water-based carrier that comprise a plurality of hard particles on an outer surface of a soft-core particle. The hard particles have a Mohs hardness at least 1 greater than a Mohs hardness of the soft core particle and/or a Vickers hardness at least 500 Kg/mm2 greater than the soft-core particle. A substrate having a substrate surface with a hardness greater than a Mohs number of 6 or a Vickers hardness greater than 1,000 kg/mm2 is placed into a CMP apparatus having a rotating polishing pad, and CMP is performed with the rotating polishing pad and the slurry to polish the substrate surface.Type: GrantFiled: August 28, 2014Date of Patent: February 14, 2017Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan, Kannan Balasundaram, Deepika Singh, Wei Bai
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Patent number: 9551075Abstract: A CMP method uses a slurry including a first metal oxide or semiconductor oxide particles (first oxide particles) in water. At least one particle feature is selected from (i) first oxide particles having a polydispersity >30%, (ii) a coating on first oxide particles including Group I or Group II ions, transition metal oxide, or organic material, (iii) first oxide particles mixed with fumed oxide particles, (iv) first oxide particles with average primary size >50 nm mixed with fumed oxide particles having average primary size <25 nm, and (v) first oxide particles with a per surface area per unit mass <100 m2/gm mixed with another oxide particle type having an average area per unit mass >150 m2/gm. A substrate having an alumina surface is placed into a CMP apparatus, and CMP is performed with a rotating polishing pad and the slurry to polish the alumina surface.Type: GrantFiled: August 4, 2014Date of Patent: January 24, 2017Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Kannan Balasundaram, Arul Chakkaravarthi Arjunan, Deepika Singh, Wei Bai
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Patent number: 9368367Abstract: Slurry compositions and chemically activated CMP methods for polishing a substrate having a silicon carbide surface using such slurries. In such methods, the silicon carbide surface is contacted with a CMP slurry composition that comprises i) a liquid carrier and ii) a plurality of particles having at least a soft surface portion, wherein the soft surface portion includes a transition metal compound that provides a Mohs hardness <6, and optionally iii) an oxidizing agent. The oxidizing agent can include a transition metal. The slurry is moved relative to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide surface is removed.Type: GrantFiled: April 13, 2009Date of Patent: June 14, 2016Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan, Dibakar Das, Deepika Singh, Abhudaya Mishra, Tanjore V. Jayaraman
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Publication number: 20160060488Abstract: A chemical mechanical polishing (CMP) includes providing a slurry including composite particles dispersed in a water-based carrier that comprise a plurality of hard particles on an outer surface of a soft-core particle. The hard particles have a Mohs hardness at least 1 greater than a Mohs hardness of the soft core particle and/or a Vickers hardness at least 500 Kg/mm2 greater than the soft-core particle. A substrate having a substrate surface with a hardness greater than a Mohs number of 6 or a Vickers hardness greater than 1,000 kg/mm2 is placed into a CMP apparatus having a rotating polishing pad, and CMP is performed with the rotating polishing pad and the slurry to polish the substrate surface.Type: ApplicationFiled: August 28, 2014Publication date: March 3, 2016Inventors: RAJIV K. SINGH, ARUL CHAKKARAVARTHI ARJUNAN, KANNAN BALASUNDARAM, DEEPIKA SINGH, WEI BAI
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Patent number: 9259819Abstract: A method of chemical mechanical polishing (CMP) a diamond containing surface includes providing a slurry including a plurality of particles, at least one oxidizer, and at least one acid, wherein the slurry has a pH?3 or pH greater than 11. At least an outer surface of the plurality of particles is softer than the diamond surface or the particles are diamond particles averaging less than (<) 2 ?m in size. The diamond surface is pressed with respect to a polishing pad providing a Shore D Hardness less than 99 having the slurry in between while rotating the polishing pad relative to the diamond surface to form a smooth diamond surface having a root mean square (rms) surface roughness less than 15 nm.Type: GrantFiled: September 23, 2014Date of Patent: February 16, 2016Assignees: Sinmat, inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Deepika Singh, Arul Chakkaravarthi Arjunan
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Publication number: 20160032461Abstract: A CMP method uses a slurry including a first metal oxide or semiconductor oxide particles (first oxide particles) in water. At least one particle feature is selected from (i) first oxide particles having a polydispersity >30%, (ii) a coating on first oxide particles including Group I or Group II ions, transition metal oxide, or organic material, (iii) first oxide particles mixed with fumed oxide particles, (iv) first oxide particles with average primary size >50 nm mixed with fumed oxide particles having average primary size <25 nm, and (v) first oxide particles with a per surface area per unit mass <100 m2/gm mixed with another oxide particle type having an average area per unit mass >150 m2/gm. A substrate having an alumina surface is placed into a CMP apparatus, and CMP is performed with a rotating polishing pad and the slurry to polish the alumina surface.Type: ApplicationFiled: August 4, 2014Publication date: February 4, 2016Inventors: RAJIV K. SINGH, KANNAN BALASUNDARAM, ARUL CHAKKARAVARTHI ARJUNAN, DEEPIKA SINGH, WEI BAI
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Patent number: 9218954Abstract: A method for forming an epitaxial layer on a substrate surface having crystalline defect or amorphous regions and crystalline non-defect regions includes preferential polishing or etching the crystalline defect or amorphous regions relative to the crystalline non-defect regions to form a decorated substrate surface having surface recess regions. A capping layer is deposited on the decorated substrate surface to cover the crystalline non-defect regions and to at least partially fill the surface recess regions. The capping layer is patterned by removing the capping layer over the crystalline non-defect regions to form exposed non-defect regions while retaining the capping layer in at least a portion of the surface recess regions. Selective epitaxy is then used to form the epitaxial layer, wherein the capping layer in the surface recess regions restricts epitaxial growth of the epitaxial layer over the surface recess regions.Type: GrantFiled: April 29, 2013Date of Patent: December 22, 2015Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan
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Publication number: 20150027981Abstract: A method of chemical mechanical polishing (CMP) a diamond containing surface includes providing a slurry including a plurality of particles, at least one oxidizer, and at least one acid, wherein the slurry has a pH?3 or pH greater than 11. At least an outer surface of the plurality of particles is softer than the diamond surface or the particles are diamond particles averaging less than (<) 2 ?m in size. The diamond surface is pressed with respect to a polishing pad providing a Shore D Hardness less than 99 having the slurry in between while rotating the polishing pad relative to the diamond surface to form a smooth diamond surface having a root mean square (rms) surface roughness less than 15 nm.Type: ApplicationFiled: September 23, 2014Publication date: January 29, 2015Inventors: RAJIV K. SINGH, DEEPIKA SINGH, ARUL CHAKKARAVARTHI ARJUNAN
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Publication number: 20150026073Abstract: Implementations described and claimed herein provide systems and methods for generating customer solutions using real-time information for new customer sales and/or current customer support. In one implementation, technical infrastructure data for a provider network is retrieved from one or more databases. The technical infrastructure data represents network assets and capabilities. Location information is obtained for at least one customer site. A product selection including a set of design attributes for one or more telecommunication products is received. A network access point for providing the one or more telecommunication products is determined based on a correlation of the technical infrastructure data with the location information. A configuration for the at least one customer site is generated based on the product selection. A design is generated based on the network access point and the at least one configured customer site.Type: ApplicationFiled: July 18, 2014Publication date: January 22, 2015Applicant: Level 3 Communications, LLC.Inventors: Jeff Storey, Yunas Nadiadi, Rene Grippo, Allen E. Dixon, Eric D. Gundersen, Luke P. Philips, Rajiv K. Singh, Sanjiv Kumar, Eric D. Prosser, Derek Hovodance, Wes Jensen, Imran A. Aslam, Maria A. Elliot, Peter Cleary
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Publication number: 20150025940Abstract: Implementations described and claimed herein provide systems and methods for generating customer solutions using real-time information for new customer sales and/or current customer support. In one implementation, technical infrastructure information for an installed network design providing one or more telecommunication products at one or more customer sites is retrieved. Customer service analytics are generated based on the technical infrastructure information and output for display on a graphical user interface.Type: ApplicationFiled: July 18, 2014Publication date: January 22, 2015Applicant: Level 3 Communications, LLCInventors: Jeff Storey, Yunas Nadiadi, Rene Grippo, Allen E. Dixon, Eric D. Gundersen, Luke P. Philips, Rajiv K. Singh, Sanjiv Kumar, Eric D. Prosser, Derek Hovodance, Wes Jensen, Imran A. Aslam, Maria A. Elliott, Peter Cleary
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Patent number: 8828874Abstract: A method of chemically-mechanically polishing a substrate having a Group III-nitride surface includes providing a chemical-mechanical polishing slurry composition. The slurry composition includes a slurry solution including a liquid carrier and an oxidizer including a transition metal or a per-based compound. The slurry solution includes at least one component that reacts with the Group III-nitride surface to form a softened Group III-nitride surface. The Group III-nitride comprising surface is contacted with the slurry composition by a pad to form the softened Group III-nitride surface. The pad is moved relative to the softened Group III-nitride surface, wherein at least a portion of the softened Group III-nitride surface is removed.Type: GrantFiled: March 28, 2011Date of Patent: September 9, 2014Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan, Deepika Singh, Abhudaya Mishra
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Publication number: 20140191243Abstract: A patterned article includes a substrate support having planar substrate surface portions including a substrate material having a substrate refractive index. A patterned surface is on the substrate support including a plurality of features lateral to the planar substrate surface portions protruding above a height of the planar substrate surface portions. At least a top surface of the plurality of features include an epi-blocking layer including at least one of (i) a non-single crystal material having a refractive index lower as compared to the substrate refractive index and (ii) a reflecting metal or a metal alloy (reflecting material). The epi-blocking layer is not on the planar substrate surface portions.Type: ApplicationFiled: January 8, 2013Publication date: July 10, 2014Applicants: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC., SINMAT, INC.Inventors: RAJIV K. SINGH, PURUSHOTTAM KUMAR, DEEPIKA SINGH
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Patent number: 8557133Abstract: Slurry compositions and chemically activated CMP methods for polishing a substrate having a silicon carbide surface using such slurries. In such methods, the silicon carbide surface is contacted with a CMP slurry composition that comprises i) a liquid carrier and ii) a plurality of particles having at least a soft surface portion, wherein the soft surface portion includes a transition metal compound that provides a Mohs hardness ?6, and optionally iii) an oxidizing agent. The oxidizing agent can include a transition metal. The slurry is moved relative to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide surface is removed.Type: GrantFiled: November 28, 2011Date of Patent: October 15, 2013Assignees: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K Singh, Arul C. Arjunan, Dibakar Das, Deepika Singh, Abhudaya Mishra, Tanjore V Jayaraman
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Publication number: 20130237041Abstract: A method for forming an epitaxial layer on a substrate surface having crystalline defect or amorphous regions and crystalline non-defect regions includes preferential polishing or etching the crystalline defect or amorphous regions relative to the crystalline non-defect regions to form a decorated substrate surface having surface recess regions. A capping layer is deposited on the decorated substrate surface to cover the crystalline non-defect regions and to at least partially fill the surface recess regions. The capping layer is patterned by removing the capping layer over the crystalline non-defect regions to form exposed non-defect regions while retaining the capping layer in at least a portion of the surface recess regions. Selective epitaxy is then used to form the epitaxial layer, wherein the capping layer in the surface recess regions restricts epitaxial growth of the epitaxial layer over the surface recess regions.Type: ApplicationFiled: April 29, 2013Publication date: September 12, 2013Applicant: Sinmat, Inc.Inventors: RAJIV K. SINGH, ARUL CHAKKARAVARTHI ARJUNAN
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Publication number: 20120252213Abstract: A method of chemically-mechanically polishing a substrate having a Group III-nitride surface includes providing a chemical-mechanical polishing slurry composition. The slurry composition includes a slurry solution including a liquid carrier and an oxidizer including a transition metal or a per-based compound. The slurry solution includes at least one component that reacts with the Group III-nitride surface to form a softened Group III-nitride surface. The Group III-nitride comprising surface is contacted with the slurry composition by a pad to form the softened Group III-nitride surface. The pad is moved relative to the softened Group III-nitride surface, wherein at least a portion of the softened Group III-nitride surface is removed.Type: ApplicationFiled: March 28, 2011Publication date: October 4, 2012Applicants: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC., SINMAT, INC.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan, Deepika Singh, Abhudaya Mishra
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Publication number: 20120070991Abstract: Slurry compositions and chemically activated CMP methods for polishing a substrate having a silicon carbide surface using such slurries. In such methods, the silicon carbide surface is contacted with a CMP slurry composition that comprises i) a liquid carrier and ii) a plurality of particles having at least a soft surface portion, wherein the soft surface portion includes a transition metal compound that provides a Mohs hardness ?6, and optionally iii) an oxidizing agent. The oxidizing agent can include a transition metal. The slurry is moved relative to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide surface is removed.Type: ApplicationFiled: November 28, 2011Publication date: March 22, 2012Applicants: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION INC., SINMAT, INC.Inventors: RAJIV K. SINGH, ARUL Chakkaravarthi ARJUNAN, DIBAKAR DAS, DEEPIKA SINGH, ABHUDAYA MISHRA, TANJORE V. JAYARAMAN
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Publication number: 20110221039Abstract: An epitaxial article includes a substrate having a substrate surface having a substrate surface composition including crystalline defect or amorphous regions and crystalline non-defect regions. The crystalline defect or amorphous regions are recessed from the substrate surface by surface recess regions. A capping material fills the surface recess regions to provide capped defects that extend from a top of the defect regions to the substrate surface. The capping material is compositionally different from the substrate surface composition. An epitaxial layer over the substrate surface provides an average crystalline defect density in at least one area having a size ?0.5 ?m2 that is ? two times lower than an average crystalline defect density in that area at or below the substrate surface.Type: ApplicationFiled: March 12, 2010Publication date: September 15, 2011Applicants: Sinmat, Inc., University of Florida Research Foundation, Inc.Inventors: Rajiv K. Singh, Arul Chakkaravarthi Arjunan, Deepika Singh