Patents by Inventor Rajesh Raghavan
Rajesh Raghavan 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: 9002499Abstract: Methods for determining a recovery state of a metal alloy are disclosed herein. In one example, a fluctuation in a crystallographic grain orientation of the metal alloy is determined by utilizing electron backscatter diffraction (EBSD) data of the metal alloy. A processor of an electron backscatter diffraction machine utilizes a local orientation deviation quantifier to correlate the fluctuation in the crystallographic grain orientation of the metal alloy with a plastic strain recovery of the metal alloy. Other examples of the method are also disclosed herein.Type: GrantFiled: March 20, 2012Date of Patent: April 7, 2015Assignee: GM Global Technology Operations LLCInventors: Rajesh Raghavan, Shashank Tiwari, Sushil Kumar Mishra
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Patent number: 8677796Abstract: A hemming station is configured for hemming a panel assembly including an outer panel having a hem flange defined by a hem edge. The hemming station includes a roller configured to fold the hem flange, a heating device configured to heat the hem edge, and a control unit. The control unit is configured to control the roller and the heating device such that the roller folds the hem flange when the temperature of the hem edge is in a predetermined temperature range.Type: GrantFiled: February 18, 2011Date of Patent: March 25, 2014Assignee: GM Global Technology Operations LLCInventors: John E. Carsley, Anil K. Sachdev, James C. O'Kane, Raja K Mishra, Rajesh Raghavan
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Publication number: 20130253691Abstract: Methods for determining a recovery state of a metal alloy are disclosed herein. In one example, a fluctuation in a crystallographic grain orientation of the metal alloy is determined by utilizing electron backscatter diffraction (EBSD) data of the metal alloy. A processor of an electron backscatter diffraction machine utilizes a local orientation deviation quantifier to correlate the fluctuation in the crystallographic grain orientation of the metal alloy with a plastic strain recovery of the metal alloy. Other examples of the method are also disclosed herein.Type: ApplicationFiled: March 20, 2012Publication date: September 26, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rajesh Raghavan, Shashank Tiwari, Sushil Kumar Mishra
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Patent number: 8431869Abstract: Defrosting, defogging, and de-icing structures are disclosed herein. An example of the structure includes at least one optically transparent member, at least one electrical strip extending along the at least one surface of the at least one optically transparent member; and an optically transparent composite established on at least the at least one surface of the at least one optically transparent member. The composite is in thermal communication with the at least one electrical strip. The composite includes a matrix, and a predetermined amount of graphene. The predetermined amount is based upon a predetermined transparency for the structure and a predetermined thermal conductivity of the structure. Furthermore, the structure is configured such that the graphene functions as a thermal conductor for substantially uniform heating of the composite and not an electrical conductor.Type: GrantFiled: June 2, 2010Date of Patent: April 30, 2013Assignee: GM Global Technology Operations LLCInventors: Rajesh Raghavan, Senthil Kumar Vadivelu
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Publication number: 20130089733Abstract: The geometric stiffness of structural sheet metal panels, such as those employed in motor vehicles, may be increased, without major increase in the mass of the panel, by application of a coating of a structural polymer. However conventional means of applying such a polymer layer require multiple applications to achieve a desired thickness. By incorporating magnetic particles in a resin, and subjecting the resin to a magnetic field as it is applied, the desired thickness may be achieved in a single application. Embodiments appropriate to the application of such a resin to both magnetic and non-magnetic materials are described.Type: ApplicationFiled: October 6, 2011Publication date: April 11, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rajesh Raghavan, Bhaskar Patham, Shivaram Ac, Arun M. Kumar, Hesham A. Ezzat, Prakash D. Mangalgiri
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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
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Publication number: 20120214015Abstract: A hemming station is configured for hemming a panel assembly including an outer panel having a hem flange defined by a hem edge. The hemming station includes a roller configured to fold the hem flange, a heating device configured to heat the hem edge, and a control unit. The control unit is configured to control the roller and the heating device such that the roller folds the hem flange when the temperature of the hem edge is in a predetermined temperature range.Type: ApplicationFiled: February 18, 2011Publication date: August 23, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: John E. Carsley, Anil K. Sachdev, James C. O'Kane, Raja K. Mishra, Rajesh Raghavan
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Publication number: 20110297661Abstract: Defrosting, defogging, and de-icing structures are disclosed herein. An example of the structure includes at least one optically transparent member, at least one electrical strip extending along the at least one surface of the at least one optically transparent member; and an optically transparent composite established on at least the at least one surface of the at least one optically transparent member. The composite is in thermal communication with the at least one electrical strip. The composite includes a matrix, and a predetermined amount of graphene. The predetermined amount is based upon a predetermined transparency for the structure and a predetermined thermal conductivity of the structure. Furthermore, the structure is configured such that the graphene functions as a thermal conductor for substantially uniform heating of the composite and not an electrical conductor.Type: ApplicationFiled: June 2, 2010Publication date: December 8, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Rajesh Raghavan, Senthil Kumar Vadivelu
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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
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Publication number: 20110035150Abstract: A system and method for dynamically mapping the position and speed of objects around a vehicle for collision avoidance purposes. The method determines the velocity of the vehicle in at least two orthogonal directions along with the position of the vehicle. From this information, a distance function map of the vehicle is created in a predefined area that includes a distance value at concentric locations from the vehicle. The distance function map is combined with distance function maps from all of the objects in the predefined area to determine whether a potential collision exists between the particular vehicle and any of the other objects.Type: ApplicationFiled: August 7, 2009Publication date: February 10, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Suresh SUNDARRAJ, Rajesh RAGHAVAN, Bhargav Ramchandra BELLUR