Patents by Inventor Sampath K. Vanimisetti
Sampath K. Vanimisetti 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: 9662738Abstract: A welding electrode includes an electrode holder and an electrode cap removably attached to the holder and having a central longitudinal axis. The cap includes a body having an end, and a welding surface that is substantially smooth and free from any grooves defined therein, and has a first diameter of from about 7 to 10 mm, a first radius of curvature, and a second radius of curvature that is different from the first radius. The cap includes a skirt portion extending away from the body and configured to bear against the holder. The skirt portion has a first face that is substantially parallel to the axis and spaced apart from the surface. The body has a second face interconnecting the first face and the surface, and the body tapers from the first face to the surface. A method of forming a resistance spot weld joint is also disclosed.Type: GrantFiled: June 16, 2014Date of Patent: May 30, 2017Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, David R. Sigler
-
Patent number: 9561621Abstract: A method and apparatus to mitigate the severity of the bond-line read-out defect, and more specifically microwave heating to locally cure adhesive bond-line in a single or two stage process comprising heating thermoset adhesive with microwave radiation until the adhesive is fully cured or partially cured. If the adhesive is partially cured, it can be fully cured by being subjected to an additional thermal cycle.Type: GrantFiled: July 2, 2012Date of Patent: February 7, 2017Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, Chen-Shih Wang
-
Patent number: 9328266Abstract: A thermosetting polymer composite composition (such as thermosetting SMC composition) or a thermosetting adhesive composition containing reduced-volume hollow shape-memory alloy particles in the thermosetting polymer composite composition or adhesive composition experiences little or no volume loss during a curing at a temperature above the transformation temperature for the particles.Type: GrantFiled: October 22, 2012Date of Patent: May 3, 2016Assignee: GM Global Technology Operations, LLCInventors: Sampath K. Vanimisetti, Chen-Shih Wang, Vidyashankar R. Buravalla
-
Patent number: 9118073Abstract: The gravimetric and volumetric efficiency of lithium ion batteries may be increased if higher capacity materials like tin and silicon are substituted for carbon as the lithium-accepting host in the negative electrode of the battery. But both tin and silicon, when fully charged with lithium, undergo expansions of up to 300% and generate appreciable internal stresses. These internal stresses, which will develop on each discharge-charge cycle, may lead to a progressive reduction in battery capacity, also known as battery fade. The effects of the internal stresses may be significantly reduced by partially embedding tin or silicon nanowires in the current collector. Additional benefit may be obtained if a 5 to 50% portion of the nanowire length at its embedded end are coated or masked with a composition which impedes lithium diffusion. Methods for embedding and masking the nanowires are described.Type: GrantFiled: February 3, 2015Date of Patent: August 25, 2015Assignee: GM Global Technology Operations LLCInventors: Mark W. Verbrugge, Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Publication number: 20150144494Abstract: The gravimetric and volumetric efficiency of lithium ion batteries may be increased if higher capacity materials like tin and silicon are substituted for carbon as the lithium-accepting host in the negative electrode of the battery. But both tin and silicon, when fully charged with lithium, undergo expansions of up to 300% and generate appreciable internal stresses. These internal stresses, which will develop on each discharge-charge cycle, may lead to a progressive reduction in battery capacity, also known as battery fade. The effects of the internal stresses may be significantly reduced by partially embedding tin or silicon nanowires in the current collector. Additional benefit may be obtained if a 5 to 50% portion of the nanowire length at its embedded end are coated or masked with a composition which impedes lithium diffusion. Methods for embedding and masking the nanowires are described.Type: ApplicationFiled: February 3, 2015Publication date: May 28, 2015Inventors: Mark W. Verbrugge, Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Patent number: 9012075Abstract: The gravimetric and volumetric efficiency of lithium ion batteries may be increased if higher capacity materials like tin and silicon are substituted for carbon as the lithium-accepting host in the negative electrode of the battery. But both tin and silicon, when fully charged with lithium, undergo expansions of up to 300% and generate appreciable internal stresses. These internal stresses, which will develop on each discharge-charge cycle, may lead to a progressive reduction in battery capacity, also known as battery fade. The effects of the internal stresses may be significantly reduced by partially embedding tin or silicon nanowires in the current collector. Additional benefit may be obtained if a 5 to 50% portion of the nanowire length at its embedded end are coated or masked with a composition which impedes lithium diffusion. Methods for embedding and masking the nanowires are described.Type: GrantFiled: January 23, 2012Date of Patent: April 21, 2015Assignee: GM Global Technology Operations LLCInventors: Mark W. Verbrugge, Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Publication number: 20140319105Abstract: A welding electrode includes an electrode holder and an electrode cap removably attached to the holder and having a central longitudinal axis. The cap includes a body having an end, and a welding surface that is substantially smooth and free from any grooves defined therein, and has a first diameter of from about 7 to 10 mm, a first radius of curvature, and a second radius of curvature that is different from the first radius. The cap includes a skirt portion extending away from the body and configured to bear against the holder. The skirt portion has a first face that is substantially parallel to the axis and spaced apart from the surface. The body has a second face interconnecting the first face and the surface, and the body tapers from the first face to the surface. A method of forming a resistance spot weld joint is also disclosed.Type: ApplicationFiled: June 16, 2014Publication date: October 30, 2014Inventors: Sampath K. Vanimisetti, David R. Sigler
-
Patent number: 8785807Abstract: A welding electrode includes an electrode holder and an electrode cap removably attached to the holder and having a central longitudinal axis. The cap includes a body having an end, and a welding surface that is substantially smooth and free from any grooves defined therein, and has a first diameter of from about 7 to 10 mm, a first radius of curvature, and a second radius of curvature that is different from the first radius. The cap includes a skirt portion extending away from the body and configured to bear against the holder. The skirt portion has a first face that is substantially parallel to the axis and spaced apart from the surface. The body has a second face interconnecting the first face and the surface, and the body tapers from the first face to the surface. A method of forming a resistance spot weld joint is also disclosed.Type: GrantFiled: March 17, 2011Date of Patent: July 22, 2014Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, David R. Sigler
-
Patent number: 8679680Abstract: Methods for decreasing mechanical degradation in a lithium battery are provided. At least a portion of one of the anode or the cathode includes a plurality of biconcave particles. The biconcave particles provide increased surface area for lithium diffusion without increasing the volume of the particles. As the lithium diffuses across the particles, the combination of convergent and divergent diffusion fronts of lithium reduces the stresses and elastic strain energy responsible for mechanical degradation of the electrode while increasing the rate of lithium intake.Type: GrantFiled: June 3, 2011Date of Patent: March 25, 2014Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Publication number: 20140011016Abstract: A thermosetting polymer composite composition (such as thermosetting SMC composition) or a thermosetting adhesive composition containing reduced-volume hollow shape-memory alloy particles in the thermosetting polymer composite composition or adhesive composition experiences little or no volume loss during a curing at a temperature above the transformation temperature for the particles.Type: ApplicationFiled: October 22, 2012Publication date: January 9, 2014Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Sampath K. VANIMISETTI, Chen-Shih WANG, Vidyashankar R. BURAVALLA
-
Publication number: 20130309436Abstract: A method and apparatus to mitigate the severity of the bond-line read-out defect, and more specifically microwave heating to locally cure adhesive bond-line in a single or two stage process comprising heating thermoset adhesive with microwave radiation until the adhesive is fully cured or partially cured. If the adhesive is partially cured, it can be fully cured by being subjected to an additional thermal cycle.Type: ApplicationFiled: July 2, 2012Publication date: November 21, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Sampath K. Vanimisetti, Chen-Shih Wang
-
Publication number: 20130189576Abstract: The gravimetric and volumetric efficiency of lithium ion batteries may be increased if higher capacity materials like tin and silicon are substituted for carbon as the lithium-accepting host in the negative electrode of the battery. But both tin and silicon, when fully charged with lithium, undergo expansions of up to 300% and generate appreciable internal stresses. These internal stresses, which will develop on each discharge-charge cycle, may lead to a progressive reduction in battery capacity, also known as battery fade. The effects of the internal stresses may be significantly reduced by partially embedding tin or silicon nanowires in the current collector. Additional benefit may be obtained if a 5 to 50% portion of the nanowire length at its embedded end are coated or masked with a composition which impedes lithium diffusion. Methods for embedding and masking the nanowires are described.Type: ApplicationFiled: January 23, 2012Publication date: July 25, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATION LLCInventors: Mark W. Verbrugge, Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Patent number: 8481170Abstract: A composite manufacture includes a first steel substrate, a second steel substrate disposed in contact with the first steel substrate to define a faying interface therebetween, and a spot weld joint penetrating the first steel substrate and the second steel substrate at the faying interface to thereby join the second steel substrate to the first steel substrate. The first steel substrate has a heat-affected zone adjacent the spot weld joint having a boundary, wherein the boundary and the faying interface define an angle therebetween of greater than about 75°.Type: GrantFiled: March 3, 2011Date of Patent: July 9, 2013Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, David R. Sigler
-
Patent number: 8341992Abstract: An apparatus for hemming multiple panels includes an anvil having a first panel and a second panel supported thereon. A roller mechanism and a curing mechanism are mounted to the hemming apparatus. The roller mechanism is adapted to move relative to the panels to fold a flanged portion of the first panel onto an edge portion of the second panel to form a joint. The curing mechanism is adapted to move relative to the panels to cure an adhesive located within the joint formed between the first panel and the second panel. The curing mechanism is located proximate to the roller mechanism, such that the first panel and the second panel may be supported by the anvil while the curing mechanism at least partially cures the adhesive.Type: GrantFiled: May 5, 2010Date of Patent: January 1, 2013Assignee: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, Rajesh Raghavan, John E. Carsley
-
Publication number: 20120308853Abstract: Methods for decreasing mechanical degradation in a lithium battery are provided. At least a portion of one of the anode or the cathode includes a plurality of biconcave particles. The biconcave particles provide increased surface area for lithium diffusion without increasing the volume of the particles. As the lithium diffuses across the particles, the combination of convergent and divergent diffusion fronts of lithium reduces the stresses and elastic strain energy responsible for mechanical degradation of the electrode while increasing the rate of lithium intake.Type: ApplicationFiled: June 3, 2011Publication date: December 6, 2012Applicant: GM Global Technology Operations LLCInventors: Sampath K. Vanimisetti, Ramakrishnan Narayanrao
-
Publication number: 20120234799Abstract: A welding electrode includes an electrode holder and an electrode cap removably attached to the holder and having a central longitudinal axis. The cap includes a body having an end, and a welding surface that is substantially smooth and free from any grooves defined therein, and has a first diameter of from about 7 to 10 mm, a first radius of curvature, and a second radius of curvature that is different from the first radius. The cap includes a skirt portion extending away from the body and configured to bear against the holder. The skirt portion has a first face that is substantially parallel to the axis and spaced apart from the surface. The body has a second face interconnecting the first face and the surface, and the body tapers from the first face to the surface. A method of forming a resistance spot weld joint is also disclosed.Type: ApplicationFiled: March 17, 2011Publication date: September 20, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Sampath K. Vanimisetti, David R. Sigler
-
Publication number: 20120225313Abstract: A composite manufacture includes a first steel substrate, a second steel substrate disposed in contact with the first steel substrate to define a faying interface therebetween, and a spot weld joint penetrating the first steel substrate and the second steel substrate at the faying interface to thereby join the second steel substrate to the first steel substrate. The first steel substrate has a heat-affected zone adjacent the spot weld joint having a boundary, wherein the boundary and the faying interface define an angle therebetween of greater than about 75°.Type: ApplicationFiled: March 3, 2011Publication date: September 6, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Sampath K. Vanimisetti, David R. Sigler
-
Publication number: 20110271728Abstract: An apparatus for hemming multiple panels includes an anvil having a first panel and a second panel supported thereon. A roller mechanism and a curing mechanism are mounted to the hemming apparatus. The roller mechanism is adapted to move relative to the panels to fold a flanged portion of the first panel onto an edge portion of the second panel to form a joint. The curing mechanism is adapted to move relative to the panels to cure an adhesive located within the joint formed between the first panel and the second panel. The curing mechanism is located proximate to the roller mechanism, such that the first panel and the second panel may be supported by the anvil while the curing mechanism at least partially cures the adhesive.Type: ApplicationFiled: May 5, 2010Publication date: November 10, 2011Inventors: Sampath K. Vanimisetti, Rajesh Raghavan, John E. Carsley