Patents by Inventor Harsha Prahlad

Harsha Prahlad 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: 7977923
    Abstract: Described herein is a generator with an electroactive polymer transducer. The transducer has a capacitance that varies with deflection of a polymer included in the transducer. The generator also includes a generator circuit, coupled to the electroactive polymer transducer, that includes a capacitor. The generator circuit is configured such that the capacitor collects electrical energy from the electroactive polymer transducer in response to a change in capacitance of the polymer.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: July 12, 2011
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Roy D. Kornbluh, Joseph S. Eckerle, Harsha Prahlad
  • Publication number: 20110110010
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Application
    Filed: December 9, 2010
    Publication date: May 12, 2011
    Applicant: SRI INTERNATIONAL
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Roy D. Kornbluh, Patrick D. Lincoln, Scott Stanford
  • Patent number: 7895985
    Abstract: Combustion devices described herein comprise a compliant combustion chamber wall or segment. The compliant segment deforms during combustion in the combustion chamber. Some devices may include a compliant wall configured to stretch responsive to pressure generated by combustion of a fuel in the combustion chamber. A coupling portion translates deformation of the compliant segment or wall into mechanical output. One or more ports are configured to inlet an oxygen source and fuel into the combustion chamber and to outlet exhaust gases from the combustion chamber.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: March 1, 2011
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Scott E. Stanford, Harsha Prahlad, Seajin Oh, Jonathan Heim, Roy D. Kornbluh
  • Patent number: 7872850
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: January 18, 2011
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Roy D. Kornbluh, Patrick D. Lincoln, Scott Stanford
  • Publication number: 20100271746
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Application
    Filed: July 2, 2010
    Publication date: October 28, 2010
    Applicant: SRI INTERNATIONAL
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Joseph S. Eckerle, Roy D. Kornbluh, Scott Stanford
  • Patent number: 7804227
    Abstract: Described herein are several solutions that increase transducer lifetime by reducing or preventing tear propagation in a compliant electroactive polymer. One solution couples a compliant tear resistant treatment to a transducer proximate to an edge portion of the electroactive polymer. Another solution uses a tear resistant layer that couples to and covers a large surface area of the transducer. Another suitable tear resistant solution provides added material outside an active area; the added material reduces stress or strain variations in polymer material outside the active area when the electroactive polymer transducer is deflected or pre-strained.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: September 28, 2010
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Roy D. Kornbluh, Harsha Prahlad, Sunity K. Sharma, Bryan Chavez, Donald E. Czyzyk, Annjoe Wong-Foy, Scott E. Stanford
  • Patent number: 7787646
    Abstract: The present invention provides electroactive polymer transducers that produce out-of-plane deflections. The transducers form a set of surface features based on deflection of an electroactive polymer. The set of surface features may include elevated polymer surface features and/or depressed electrode surface features. Actuation of an active area may produce the polymer deflection that creates one or more surface features. A passive layer may operably connect to a polymer. The passive layer may comprise a thicker and softer material to amplify polymer thickness changes and increase surface feature visibility.
    Type: Grant
    Filed: July 29, 2007
    Date of Patent: August 31, 2010
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Roy D. Kornbluh, Harsha Prahlad
  • Patent number: 7773363
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: August 10, 2010
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Joseph S. Eckerle, Roy D. Kornbluh, Scott Stanford
  • Publication number: 20100059298
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Application
    Filed: May 15, 2009
    Publication date: March 11, 2010
    Applicant: SRI INTERNATIONAL
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Roy D. Kornbluh, Patrick D. Lincoln, Scott Stanford
  • Publication number: 20100027187
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Application
    Filed: July 30, 2007
    Publication date: February 4, 2010
    Applicant: SRI INTERNATIONAL
    Inventors: Ronald E. PELRINE, Harsha PRAHLAD, Joseph S. ECKERLE, Roy D. KORNBLUH, Scott STANFORD
  • Patent number: 7649276
    Abstract: Described herein are marine devices and methods that convert mechanical energy in one or more waves to mechanical energy that is better suited for conversion into electrical energy. The marine devices employ a mechanical energy conversion system that harnesses wave energy and converts it into limited motion that is suitable for input to an electrical energy generator.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: January 19, 2010
    Assignee: SRI International
    Inventors: Roy D. Kornbluh, Ronald E. Pelrine, Harsha Prahlad, Seiki Chiba, Joseph S. Eckerle, Bryan Chavez, Scott E. Stanford, Thomas Low
  • Patent number: 7598652
    Abstract: The present invention provides meta-materials with an actively controllable mechanical property. The meta-material includes a deformable structure and a set of activation elements. The activation elements are controllable between multiple states. The meta-material includes a first value for a mechanical property when one or more of the activation elements is in the first activation state and includes a second value for the mechanical property when the activation elements have been activated to the second activation state. In one aspect, the meta-material resembles a composite material where the connectivity between the component materials or shape and arrangement of the component materials is dynamically controllable so as to affect a mechanical property of the meta-material.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: October 6, 2009
    Assignee: SRI International
    Inventors: Roy D. Kornbluh, Ronald E. Pelrine, Harsha Prahlad, Scott E. Stanford
  • Patent number: 7598651
    Abstract: The present invention provides meta-materials with an actively controllable mechanical property. The meta-material includes a deformable structure and a set of activation elements. The activation elements are controllable between multiple states. The meta-material includes a first value for a mechanical property when one or more of the activation elements is in the first activation state and includes a second value for the mechanical property when the activation elements have been activated to the second activation state. In one aspect, the meta-material resembles a composite material where the connectivity between the component materials or shape and arrangement of the component materials is dynamically controllable so as to affect a mechanical property of the meta-material.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: October 6, 2009
    Assignee: SRI International
    Inventors: Roy D. Kornbluh, Ronald E. Pelrine, Harsha Prahlad, Scott E. Stanford
  • Publication number: 20090241894
    Abstract: Combustion devices described herein comprise a compliant combustion chamber wall or segment. The compliant segment deforms during combustion in the combustion chamber. Some devices may include a compliant wall configured to stretch responsive to pressure generated by combustion of a fuel in the combustion chamber. A coupling portion translates deformation of the compliant segment or wall into mechanical output. One or more ports are configured to inlet an oxygen source and fuel into the combustion chamber and to outlet exhaust gases from the combustion chamber.
    Type: Application
    Filed: December 30, 2008
    Publication date: October 1, 2009
    Applicant: SRI INTERNATIONAL
    Inventors: Ronald E. Pelrine, Scott E. Stanford, Harsha Prahlad, Seajin Oh, Jonathan Heim, Roy D. Kornbluh
  • Patent number: 7567681
    Abstract: The present invention provides electroactive polymer transducers that produce out-of-plane deflections. The transducers form a set of surface features based on deflection of an electroactive polymer. The set of surface features may include elevated polymer surface features and/or depressed electrode surface features. Actuation of an active area may produce the polymer deflection that creates one or more surface features. A passive layer may operably connect to a polymer. The passive layer may comprise a thicker and softer material to amplify polymer thickness changes and increase surface feature visibility.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: July 28, 2009
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Roy D. Kornbluh, Harsha Prahlad
  • Patent number: 7557456
    Abstract: Described herein are systems and methods that use an electroactive polymer transducer to convert mechanical energy, originally contained in one or more waves, to electrical energy. Marine devices described herein may employ a mechanical energy conversion system that transfers mechanical energy in a wave into mechanical energy suitable for input to the electroactive polymer transducer.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: July 7, 2009
    Assignee: SRI International
    Inventors: Roy D. Kornbluh, Ronald E. Pelrine, Harsha Prahlad, Seiki Chiba, Joseph S. Eckerle, Bryan Chavez, Scott E. Stanford, Thomas Low
  • Patent number: 7554787
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: June 30, 2009
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Roy D. Kornbluh, Patrick D. Lincoln, Scott Stanford
  • Patent number: 7551419
    Abstract: Described herein is electroadhesion technology that permits controllable adherence between two objects. Electroadhesion uses electrostatic forces of attraction produced by an electrostatic adhesion voltage, which is applied using electrodes in an electroadhesive device. The electrostatic adhesion voltage produces an electric field and electrostatic adherence forces. When the electroadhesive device and electrodes are positioned near a surface of an object such as a vertical wall, the electrostatic adherence forces hold the electroadhesive device in position relative to the surface and object. This can be used to increase traction or maintain the position of the electroadhesive device relative to a surface. Electric control of the electrostatic adhesion voltage permits the adhesion to be controllably and readily turned on and off.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: June 23, 2009
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Harsha Prahlad, Joseph S. Eckerle, Roy D. Kornbluh, Scott Stanford
  • Patent number: 7538445
    Abstract: Described herein are marine devices and methods that convert mechanical energy in one or more waves to mechanical energy that is better suited for conversion into electrical energy. The marine devices employ a mechanical energy conversion system that harnesses wave energy and converts it into limited motion that is suitable for input to an electrical energy generator.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: May 26, 2009
    Assignee: SRI International
    Inventors: Roy D. Kornbluh, Ronald E. Pelrine, Harsha Prahlad, Seiki Chiba, Joseph S. Eckerle, Bryan Chavez, Scott E. Stanford, Thomas Low
  • Patent number: 7485978
    Abstract: Combustion devices described herein comprise a compliant combustion chamber wall or segment. The compliant segment deforms during combustion in the combustion chamber. Some devices may include a compliant wall configured to stretch responsive to pressure generated by combustion of a fuel in the combustion chamber. A coupling portion translates deformation of the compliant segment or wall into mechanical output. One or more ports are configured to inlet an oxygen source and fuel into the combustion chamber and to outlet exhaust gases from the combustion chamber.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: February 3, 2009
    Assignee: SRI International
    Inventors: Ronald E. Pelrine, Scott E. Stanford, Harsha Prahlad, Seajin Oh, Jonathan Heim, Roy D. Kornbluh