Patents by Inventor Siva SANKAR VOOSANI KRISHNA

Siva SANKAR VOOSANI KRISHNA 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: 11876272
    Abstract: A fuel-cell stack has a first end plate and a second end plate and a plurality of fuel cells arranged between the end plates. At least one elastic tensioning element is tensioned in the stack direction between the end plates. Furthermore, a re-tensioning element is arranged between the tensioning element and a surface section of the fuel-cell stack. The re-tensioning element has a tensioning body and at least one adjusting element arranged between the tensioning body and the surface section. A distance between the tensioning body and the surface section can be variably adjusted and fixed by the at least one adjusting element.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: January 16, 2024
    Assignees: VOLKSWAGEN AG, AUDI AG
    Inventors: Adel Jilani, Siva Sankar Voosani Krishna
  • Patent number: 11817611
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one tensioning or tensile element is tensioned in the stack direction between the end plates. Inlet and outlet ports for operating resources are arranged in first end areas of the first end plates and in second end areas of the second end plates. At least one additional elastic tensioning element is tensioned between first end areas and/or second end areas of the end plates.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: November 14, 2023
    Assignees: Volkswagen AG, Audi AG
    Inventors: Adel Jilani, Siva Sankar Voosani Krishna
  • Patent number: 11791492
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one elastic tensioning element is tensioned in the stack direction between the end plates. Furthermore, the fuel cell stack has at least one rotatably mounted mounting shaft. At least one end section of at least one tensioning element is fixed to the rotating mounting shaft. Moreover, the rotatable mounting shaft is connected to the fuel cell stack via a tensioned torsion spring. The torsion spring brings about an automatic retensioning of the tensioning element.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: October 17, 2023
    Assignees: Volkswagen AG, Audi AG
    Inventors: Adel Jilani, Siva Sankar Voosani Krishna
  • Patent number: 11764387
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one elastic tensioning element is tensioned in a stack direction between the end plates. According to the invention, a section of the at least one tensioning element is arranged between a surface section of the fuel cell stack and a retensioning element, wherein a distance between the retensioning element and the surface section can be variably adjusted and set. In this way, the tensioning element can be stretched in a targeted manner by means of the retensioning element and as such the compressive tensile force acting on the fuel cell stack can be increased. A vehicle is also provided comprising such a fuel cell stack.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: September 19, 2023
    Assignees: Audi AG, Volkswagen AG
    Inventors: Adel Jilani, Siva Sankar Voosani Krishna
  • Publication number: 20210367258
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one elastic tensioning element is tensioned in a stack direction between the end plates. According to the invention, a section of the at least one tensioning element is arranged between a surface section of the fuel cell stack and a retensioning element wherein a distance between the retensioning element and the surface section can be variably adjusted and set. In this way, the tensioning element can be stretched in a targeted manner by means of the retensioning element and as such the compressive tensile force acting on the fuel cell stack can be increased. A vehicle is also provided comprising such a fuel cell stack.
    Type: Application
    Filed: May 10, 2019
    Publication date: November 25, 2021
    Inventors: Adel JILANI, Siva SANKAR VOOSANI KRISHNA
  • Publication number: 20210273253
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one elastic tensioning element is tensioned in the stack direction between the end plates. Furthermore, the fuel cell stack has at least one rotatably mounted mounting shaft. At least one end section of at least one tensioning element is fixed to the rotating mounting shaft. Moreover, the rotatable mounting shaft is connected to the fuel cell stack via a tensioned torsion spring. The torsion spring brings about an automatic retensioning of the tensioning element.
    Type: Application
    Filed: May 10, 2019
    Publication date: September 2, 2021
    Inventors: Adel JILANI, Siva SANKAR VOOSANI KRISHNA
  • Publication number: 20210265649
    Abstract: A fuel cell stack is provided comprising a first end plate and a second end plate between which a plurality of fuel cells is arranged. At least one tensioning or tensile element is tensioned in the stack direction between the end plates. Inlet and outlet ports for operating resources are arranged in first end areas of the first end plates and in second end areas of the second end plates. At least one additional elastic tensioning element is tensioned between first end areas and/or second end areas of the end plates.
    Type: Application
    Filed: May 10, 2019
    Publication date: August 26, 2021
    Inventors: Adel JILANI, Siva SANKAR VOOSANI KRISHNA
  • Publication number: 20210043959
    Abstract: A fuel-cell stack has a first end plate and a second end plate and a plurality of fuel cells arranged between the end plates. At least one elastic tensioning element is tensioned in the stack direction between the end plates. Furthermore, a re-tensioning element is arranged between the tensioning element and a surface section of the fuel-cell stack. The re-tensioning element has a tensioning body and at least one adjusting element arranged between the tensioning body and the surface section. A distance between the tensioning body and the surface section can be variably adjusted and fixed by means of the at least one adjusting element.
    Type: Application
    Filed: January 18, 2019
    Publication date: February 11, 2021
    Inventors: Adel JILANI, Siva SANKAR VOOSANI KRISHNA