Patents by Inventor MAHESH KRISHNAMURTHI
MAHESH KRISHNAMURTHI 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: 20180191230Abstract: A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least two stators having a plurality of stator poles. The at least two rotors and the at least two stators are positioned about a central axis with the stator placed between the rotors. In other embodiments, the number of stators equals the number of rotors and effectively operate as a single stator and rotor. In yet another embodiment, the effective single stator and rotor type high rotor pole switched reluctance machine is realized as single stator and rotor positioned concentrically around a central axis.Type: ApplicationFiled: March 4, 2018Publication date: July 5, 2018Inventors: Mahesh Krishnamurthy, Mark Johnston, Trevor Creary, Piyush Desai
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Patent number: 9997304Abstract: Systems and methods for providing illumination to illuminable portions of keys associated with a keyboard are described. A key includes a light guide positioned below a keycap. The light guide includes one or more sidewalls that exhibit high internal reflection. In many examples, light guide sidewalls are formed with one or more prisms.Type: GrantFiled: May 13, 2016Date of Patent: June 12, 2018Assignee: APPLE INC.Inventors: Craig C. Leong, Bradford J. Zercoe, Dinesh C. Mathew, Mahesh Krishnamurthi, Robert Y. Cao, Jun Qi, Rong Liu, Victor H. Yin
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Patent number: 9971084Abstract: Described is an illumination structure for a key of a keyboard. The illumination structure is used to uniformly illuminate the key and any glyphs that are present on the key. The illumination structure includes a light guide having various features that increase total internal reflection and also illuminate the glyphs of the key.Type: GrantFiled: February 3, 2016Date of Patent: May 15, 2018Assignee: APPLE INC.Inventors: Robert Y. Cao, Craig C. Leong, Bradford J. Zercoe, Dinesh C. Mathew, Mahesh Krishnamurthi, Jun Qi, Rong Liu, Victor H. Yin
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Patent number: 9960662Abstract: A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least one stator having a plurality of stator poles. The at least two rotors and the at least one stator are positioned about a central axis with the stator placed between, and laterally adjacent to the rotors. A multiple stator HRSRM comprises at least two stators having a plurality of stator poles and at least one rotor having a plurality of rotor poles. The at least two stators and at least one rotor are positioned about a central axis with the rotor placed between and laterally adjacent to the stators.Type: GrantFiled: February 4, 2016Date of Patent: May 1, 2018Assignee: Software Motor CompanyInventors: Mahesh Krishnamurthy, Mark Johnston, Trevor Creary, Piyush Desai
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Patent number: 9813006Abstract: A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; storing the self-inductance value and the first current value for each of the stator phases; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; storing the mutual inductance value and the second current value for each of the stator phases; estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.Type: GrantFiled: January 23, 2017Date of Patent: November 7, 2017Assignee: Software Motor CorporationInventors: Mahesh Krishnamurthy, Trevor Creary
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Patent number: 9709734Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical coupler. In some embodiments, the device may include an optical waveguide to transmit light input from a light source. The optical waveguide may include a semiconductor layer, having a trench with one facet that comprises an edge formed under an approximately 45 degree angle and another facet formed substantially normal to the semiconductor layer. The edge may interface with another medium to form a mirror to receive inputted light and reflect received light substantially perpendicularly to propagate the received light. Other embodiments may be described and/or claimed.Type: GrantFiled: March 30, 2016Date of Patent: July 18, 2017Assignee: Intel CorporationInventors: Mahesh Krishnamurthi, Judson Ryckman, Haisheng Rong, Ling Liao, Harel Frish, Oshrit Harel, Assia Barkai, Yun-Chung Na, Han-Din Liu
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Patent number: 9658396Abstract: Described herein are an apparatus, system, and method for providing a vertical optical coupler (VOC) for planar photonics circuits such as photonics circuits fabricated on silicon-on-insulator (SOI) wafers. In one embodiment, the VOC comprises a waveguide made from a material having refractive index in a range of 1.45 to 3.45, the waveguide comprising: a first end configured to reflect light nearly vertical by total internal reflection between the waveguide and another medium, a second end to receive the light for reflection, and a third end to output the reflected light. The VOC couples with a Si waveguide having a first region including: a first end to receive light; and an inverted tapered end in the direction of light propagation to output the received light, wherein the inverted tapered end of the Si waveguide is positioned inside the waveguide.Type: GrantFiled: September 29, 2011Date of Patent: May 23, 2017Assignee: Intel CorporationInventors: Haisheng Rong, Ofir Gan, Pradeep Srinivasan, Assia Barkai, I-Wei Andy Hsieh, Mahesh Krishnamurthi, Yun-Chung Neil Na
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Publication number: 20170090106Abstract: Described is an illumination structure for a key of a keyboard. The illumination structure is used to uniformly illuminate the key and any glyphs that are present on the key. The illumination structure includes a light guide having various features that increase total internal reflection and also illuminate the glyphs of the key.Type: ApplicationFiled: September 11, 2016Publication date: March 30, 2017Inventors: Robert Y. Cao, Craig C. Leong, Bradford J. Zercoe, Dinesh C. Mathew, Mahesh Krishnamurthi, Jun Qi, Rong Liu, Victor H. Yin
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Publication number: 20170090104Abstract: Described is an illumination structure for a key of a keyboard. The illumination structure is used to uniformly illuminate the key and any glyphs that are present on the key. The illumination structure includes a light guide having various features that increase total internal reflection and also illuminate the glyphs of the key.Type: ApplicationFiled: February 3, 2016Publication date: March 30, 2017Inventors: Robert Y. Cao, Craig C. Leong, Bradford J. Zercoe, Dinesh C. Mathew, Mahesh Krishnamurthi, Jun Qi, Rong Liu, Victor H. Yin
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Patent number: 9553538Abstract: A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; storing the self-inductance value and the first current value for each of the stator phases; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; storing the mutual inductance value and the second current value for each of the stator phases; estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.Type: GrantFiled: February 4, 2016Date of Patent: January 24, 2017Assignee: Software Motor CorporationInventors: Mahesh Krishnamurthy, Trevor Creary
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Publication number: 20160365780Abstract: A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least one stator having a plurality of stator poles. The at least two rotors and the at least one stator are positioned about a central axis with the stator placed between, and laterally adjacent to the rotors. A multiple stator HRSRM comprises at least two stators having a plurality of stator poles and at least one rotor having a plurality of rotor poles. The at least two stators and at least one rotor are positioned about a central axis with the rotor placed between and laterally adjacent to the stators.Type: ApplicationFiled: February 4, 2016Publication date: December 15, 2016Inventors: Mahesh Krishnamurthy, Mark Johnston, Trevor Creary, Piyush Desai
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Publication number: 20160336124Abstract: Systems and methods for providing illumination to illuminable portions of keys associated with a keyboard are described. A key includes a light guide positioned below a keycap. The light guide includes one or more sidewalls that exhibit high internal reflection. In many examples, light guide sidewalls are formed with one or more prisms.Type: ApplicationFiled: May 13, 2016Publication date: November 17, 2016Inventors: Craig C. Leong, Bradford J. Zercoe, Dinesh C. Mathew, Mahesh Krishnamurthi, Robert Y. Cao, Jun Qi, Rong Liu, Victor H. Yin
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Publication number: 20160226418Abstract: A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; storing the self-inductance value and the first current value for each of the stator phases; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; storing the mutual inductance value and the second current value for each of the stator phases; estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.Type: ApplicationFiled: February 4, 2016Publication date: August 4, 2016Inventors: Mahesh Krishnamurthy, Trevor Creary
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Publication number: 20160209589Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical coupler. In some embodiments, the device may include an optical waveguide to transmit light input from a light source. The optical waveguide may include a semiconductor layer, having a trench with one facet that comprises an edge formed under an approximately 45 degree angle and another facet formed substantially normal to the semiconductor layer. The edge may interface with another medium to form a mirror to receive inputted light and reflect received light substantially perpendicularly to propagate the received light. Other embodiments may be described and/or claimed.Type: ApplicationFiled: March 30, 2016Publication date: July 21, 2016Inventors: Mahesh Krishnamurthi, Judson Ryckman, Haisheng Rong, Ling Liao, Harel Frish, Oshrit Harel, Assia Barkai, Yun-Chung Na, Han-Din Liu
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Patent number: 9395494Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical device having a semiconductor layer to propagate light and a mirror disposed inside the semiconductor layer and having echelle grating reflective surface to substantially totally internally reflect the propagating light inputted by one or more input waveguides, to be received by one or more output waveguides. The waveguides may be disposed in the semiconductor layer under a determined angle relative to the mirror reflective surface. The determined angle may be equal to or greater than a total internal reflection angle corresponding to the interface, to provide substantially total internal reflection of light by the mirror. The mirror may be formed by an interface of the semiconductor layer comprising the mirror reflective surface and another medium filling the mirror, such as a dielectric. Other embodiments may be described and/or claimed.Type: GrantFiled: December 16, 2015Date of Patent: July 19, 2016Assignee: Intel CorporationInventors: Mahesh Krishnamurthi, I-Wei Hsieh, Haisheng Rong, Oshrit Harel, Harel Frish, Assia Barkai, Wenhua Lin
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Patent number: 9348099Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical coupler. In some embodiments, the device may include an optical waveguide to transmit light input from a light source. The optical waveguide may include a semiconductor layer, having a trench with one facet that comprises an edge formed under an approximately 45 degree angle and another facet formed substantially normal to the semiconductor layer. The edge may interface with another medium to form a mirror to receive inputted light and reflect received light substantially perpendicularly to propagate the received light. Other embodiments may be described and/or claimed.Type: GrantFiled: July 18, 2014Date of Patent: May 24, 2016Assignee: Intel CorporationInventors: Mahesh Krishnamurthi, Judson Ryckman, Haisheng Rong, Ling Liao, Harel Frish, Oshrit Harel, Assia Barkai, Yun-Chung Na, Han-Din Liu
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Publication number: 20160103282Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical device having a semiconductor layer to propagate light and a mirror disposed inside the semiconductor layer and having echelle grating reflective surface to substantially totally internally reflect the propagating light inputted by one or more input waveguides, to be received by one or more output waveguides. The waveguides may be disposed in the semiconductor layer under a determined angle relative to the mirror reflective surface. The determined angle may be equal to or greater than a total internal reflection angle corresponding to the interface, to provide substantially total internal reflection of light by the mirror. The mirror may be formed by an interface of the semiconductor layer comprising the mirror reflective surface and another medium filling the mirror, such as a dielectric. Other embodiments may be described and/or claimed.Type: ApplicationFiled: December 16, 2015Publication date: April 14, 2016Inventors: MAHESH KRISHNAMURTHI, I-WEI HSIEH, HAISHENG RONG, OSHRIT HAREL, HAREL FRISH, ASSIA BARKAI, WENHUA LIN
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Patent number: 9250388Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical device having a semiconductor layer to propagate light and a mirror disposed inside the semiconductor layer and having echelle grating reflective surface to substantially totally internally reflect the propagating light inputted by one or more input waveguides, to be received by one or more output waveguides. The waveguides may be disposed in the semiconductor layer under a determined angle relative to the mirror reflective surface. The determined angle may be equal to or greater than a total internal reflection angle corresponding to the interface, to provide substantially total internal reflection of light by the mirror. The mirror may be formed by an interface of the semiconductor layer comprising the mirror reflective surface and another medium filling the mirror, such as a dielectric. Other embodiments may be described and/or claimed.Type: GrantFiled: July 17, 2014Date of Patent: February 2, 2016Assignee: INTEL CORPORATIONInventors: Mahesh Krishnamurthi, I-Wei Hsieh, Haisheng Rong, Oshrit Harel, Harel Frish, Assia Barkai, Wenhua Lin
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Publication number: 20160018610Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical coupler. In some embodiments, the device may include an optical waveguide to transmit light input from a light source. The optical waveguide may include a semiconductor layer, having a trench with one facet that comprises an edge formed under an approximately 45 degree angle and another facet formed substantially normal to the semiconductor layer. The edge may interface with another medium to form a mirror to receive inputted light and reflect received light substantially perpendicularly to propagate the received light. Other embodiments may be described and/or claimed.Type: ApplicationFiled: July 18, 2014Publication date: January 21, 2016Inventors: MAHESH KRISHNAMURTHI, Judson Ryckman, Haisheng Rong, Ling Liao, Harel Frish, Oshrit Harel, Assia Barkai, Shu-Lu Chen, Yun-Chung Na, Han-Din Liu
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Publication number: 20160018595Abstract: Embodiments of the present disclosure are directed toward techniques and configurations for an optical device having a semiconductor layer to propagate light and a mirror disposed inside the semiconductor layer and having echelle grating reflective surface to substantially totally internally reflect the propagating light inputted by one or more input waveguides, to be received by one or more output waveguides. The waveguides may be disposed in the semiconductor layer under a determined angle relative to the mirror reflective surface. The determined angle may be equal to or greater than a total internal reflection angle corresponding to the interface, to provide substantially total internal reflection of light by the mirror. The mirror may be formed by an interface of the semiconductor layer comprising the mirror reflective surface and another medium filling the mirror, such as a dielectric. Other embodiments may be described and/or claimed.Type: ApplicationFiled: July 17, 2014Publication date: January 21, 2016Inventors: MAHESH KRISHNAMURTHI, I-WEI HSIEH, HAISHENG RONG, OSHRIT HAREL, HAREL FRISH, ASSIA BARKAI, WENHUA LIN