Patents by Inventor Sreeram Balasubramanian

Sreeram Balasubramanian 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: 11305457
    Abstract: Methods and apparatus are provided for pressure casting ceramic bodies. Methods and apparatus are provided for rapid ejection of cast ceramic bodies from a mold. A mold is described that has an impermeable cavity surface to provide dry release of the cast body. Ceramic bodies produced by the methods and apparatus have smooth, non-tacky surfaces after ejection from the mold.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: April 19, 2022
    Assignee: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Hugo Gonzalez, Sreeram Balasubramanian, Mathew David Campbell
  • Publication number: 20220098115
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material stabilized with 5 mol % yttria to 8 mol % yttria, and methods for making a sintered body from the ceramic material. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 300 MPa, or at least 500 MPa, when fully sintered.
    Type: Application
    Filed: October 27, 2021
    Publication date: March 31, 2022
    Inventors: Yan Yang, Sreeram Balasubramanian
  • Publication number: 20220033316
    Abstract: A method is provided for making ceramic bodies having improved properties, such as optical and/or strength properties in which the ceramic bodies are densified by new sintering processes. The sintering profiles may have shorter run times than conventional sintering processes. Ceramic bodies made by these methods are suitable for use in dental applications, for example, as crowns.
    Type: Application
    Filed: October 18, 2021
    Publication date: February 3, 2022
    Inventors: Sreeram Balasubramanian, Yan Yang, Akash
  • Patent number: 11161789
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material stabilized with 5 mol % yttria to 8 mol % yttria, and methods for making a sintered body from the ceramic material. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 300 MPa, or at least 500 MPa, when fully sintered.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: November 2, 2021
    Assignee: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Yan Yang, Sreeram Balasubramanian
  • Patent number: 11148979
    Abstract: A method is provided for making ceramic bodies having improved properties, such as optical and/or strength properties in which the ceramic bodies are densified by new sintering processes. The sintering profiles may have shorter run times than conventional sintering processes. Ceramic bodies made by these methods are suitable for use in dental applications, for example, as crowns.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: October 19, 2021
    Assignee: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Sreeram Balasubramanian, Yan Yang, Akash
  • Publication number: 20210236389
    Abstract: A method for masking the appearance of a support structure underlying a highly translucent ceramic dental restoration s provided. The porous form of a zirconia ceramic dental restoration is treated with a liquid masking composition comprising 0.4 wt % to 50 wt % of one or more masking agents. The masking composition is applied to the internal surface of a restoration and a region of the facial surface of the restoration that is opposite the internal surface. After application of the masking compositions, treated zirconia restoration is sintered to greater than 98% theoretical density.
    Type: Application
    Filed: February 3, 2021
    Publication date: August 5, 2021
    Inventors: Yan Yang, Sreeram Balasubramanian, Yang Soon Park
  • Publication number: 20200346366
    Abstract: Methods and apparatus are provided for pressure casting ceramic bodies. Methods and apparatus are provided for rapid ejection of cast ceramic bodies from a mold. A mold is described that has an impermeable cavity surface to provide dry release of the cast body.
    Type: Application
    Filed: April 30, 2020
    Publication date: November 5, 2020
    Inventors: Hugo Gonzalez, Sreeram Balasubramanian, Mathew David Campbell
  • Publication number: 20200107996
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material comprising from 4.5 mol % to 5.1 mol % yttria. Optionally, the zirconia ceramic has a coloring agent that may comprise one or more metals selected from terbium (Tb), chromium (Cr), erbium (Er), and cobalt (Co), and further, may, optionally, comprise alumina, which if present may be in an amount from 0 wt % to 0.25 wt %. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 800 MPa when fully sintered.
    Type: Application
    Filed: December 9, 2019
    Publication date: April 9, 2020
    Inventors: Sreeram Balasubramanian, Tyler Arthur Gubb, Akash, Thomas C. Valenti, Yan Yang, Kevin Michael Recor
  • Publication number: 20200062653
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material stabilized with 5 mol % yttria to 8 mol % yttria, and methods for making a sintered body from the ceramic material. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 300 MPa, or at least 500 MPa, when fully sintered.
    Type: Application
    Filed: August 20, 2019
    Publication date: February 27, 2020
    Inventors: Yan Yang, Sreeram Balasubramanian
  • Patent number: 10532008
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material comprising from 4.5 mol % to 5.1 mol % yttria. Optionally, the zirconia ceramic has a coloring agent that may comprise one or more metals selected from terbium (Tb), chromium (Cr), erbium (Er), and cobalt (Co), and further, may, optionally, comprise alumina, which if present may be in an amount from 0 wt % to 0.25 wt %. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 800 MPa when fully sintered.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: January 14, 2020
    Assignee: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Sreeram Balasubramanian, Tyler Arthur Gubb, Akash, Thomas C. Valenti, Yan Yang, Kevin Michael Recor
  • Publication number: 20190127284
    Abstract: A method is provided for making ceramic bodies having improved properties, such as optical and/or strength properties in which the ceramic bodies are densified by new sintering processes. The sintering profiles may have shorter run times than conventional sintering processes. Ceramic bodies made by these methods are suitable for use in dental applications, for example, as crowns.
    Type: Application
    Filed: October 31, 2018
    Publication date: May 2, 2019
    Inventors: Sreeram Balasubramanian, Yan Yang, Akash
  • Publication number: 20180235847
    Abstract: A zirconia ceramic material for use in dental applications is provided comprising an yttria-stabilized zirconia material comprising from 4.5 mol % to 5.1 mol % yttria. Optionally, the zirconia ceramic has a coloring agent that may comprise one or more metals selected from terbium (Tb), chromium (Cr), erbium (Er), and cobalt (Co), and further, may, optionally, comprise alumina, which if present may be in an amount from 0 wt % to 0.25 wt %. The zirconia ceramic materials exhibit both enhanced translucency and a flexural strength of at least 800 MPa when fully sintered.
    Type: Application
    Filed: February 21, 2018
    Publication date: August 23, 2018
    Inventors: Sreeram Balasubramanian, Tyler Arthur Gubb, Akash, Thomas C. Valenti, Yan Yang, Kevin Michael Recor
  • Patent number: 9637415
    Abstract: A method of making high purity crystalline AlON bodies by synthesizing and calcining AlON powders having less than 80 ppm Si, Mg, Ca, Na, and K impurities. The AlON powders are milled to reduce the particle size of the AlON powders using a high purity milling media. An AlON body is formed from the milled AlON powders. Such AlON bodies are particularly suitable for semiconductor process chamber components.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: May 2, 2017
    Assignee: SURMET CORPORATION
    Inventors: Suri A. Sastri, Sreeram Balasubramanian, Lee M. Goldman
  • Publication number: 20150115507
    Abstract: A method of making high purity crystalline AlON bodies by synthesizing and calcining AlON powders having less than 80 ppm Si, Mg, Ca, Na, and K impurities. The AION powders are milled to reduce the particle size of the AlON powders using a high purity milling media. An AlON body is formed from the milled AlON powders. Such AlON bodies are particularly suitable for semiconductor process chamber components.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 30, 2015
    Inventors: Suri A. Sastri, Sreeram Balasubramanian, Lee M. Goldman