Patents by Inventor PREETHAM P. RAO

PREETHAM P. RAO 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: 11670525
    Abstract: Methods and apparatus for reducing leakage of microwaves at a slit valve of a process chamber. A multi-frequency resonant choke around the slit valve prevents microwave energy from a band of frequencies from escaping from the slit valve. The multi-frequency resonant choke may have a sloping bottom surface or a serrated bottom surface to enable multiple frequencies to resonant in the choke, canceling a range of microwave frequencies at gaps formed by a slit valve gate.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: June 6, 2023
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Preetham P. Rao, Ananthkrishna Jupudi, Ribhu Gautam
  • Patent number: 11629409
    Abstract: Methods and apparatus for a substrate processing chamber are provided herein. In some embodiments, a substrate processing chamber includes a chamber body having sidewalls defining an interior volume having a polygon shape; a selectively sealable elongated opening disposed in an upper portion of the chamber body for transferring one or more substrates into or out of the chamber body; a funnel disposed at a first end of the chamber body, wherein the funnel increases in size along a direction from an outer surface of the chamber body to the interior volume; and a pump port disposed at a second end of the chamber body opposite the funnel.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: April 18, 2023
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Ribhu Gautam, Ananthkrishna Jupudi, Tuck Foong Koh, Preetham P. Rao, Vinodh Ramachandran, Yueh Sheng Ow, Yuichi Wada, Cheng-Hsiung Tsai, Kai Liang Liew
  • Patent number: 11375584
    Abstract: Methods and apparatus for processing a substrate are provided herein. The apparatus can include, for example, a microwave energy source configured to provide microwave energy from beneath a substrate support provided in an inner volume of the process chamber; a first microwave reflector positioned on the substrate support above a substrate supporting position of the substrate support; and a second microwave reflector positioned on the substrate support beneath the substrate supporting position, wherein the first microwave reflector and the second microwave reflector are positioned and configured such that microwave energy passes through the second microwave reflector and some of the microwave energy is reflected from a bottom surface of the first microwave reflector back to the substrate during operation.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: June 28, 2022
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Tuck Foong Koh, Yueh Sheng Ow, Nuno Yen-Chu Chen, Ananthkrishna Jupudi, Preetham P. Rao
  • Patent number: 10971383
    Abstract: Methods and apparatus for measuring the temperature of epoxy resin in an electronics package are provided herein. In some embodiments, apparatus for encapsulating an electronics package includes: a process chamber having a chamber body enclosing a processing volume; a substrate support having a support surface for receiving and supporting a substrate for forming an electronics package; and a temperature sensor to measure a temperature of an epoxy resin in an electronics package. The temperature sensor includes: an input apparatus including at least a light source disposed outside the chamber body to provide an excitation light energy to a portion of the epoxy resin; and an output apparatus including at least a signal analyzer disposed outside the chamber body to detect fluorescent light energy emitted by the portion of the epoxy resin and determine a temperature of the epoxy resin based on the excitation light energy and the fluorescent light energy.
    Type: Grant
    Filed: February 6, 2020
    Date of Patent: April 6, 2021
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Preetham P. Rao, Ananthkrishna Jupudi
  • Patent number: 10950475
    Abstract: Methods and apparatus for processing a substrate are provided. The apparatus, for example, can include a process chamber comprising a chamber body defining a processing volume and having a view port coupled to the chamber body; a substrate support disposed within the processing volume and having a support surface to support a substrate; and an infrared temperature sensor (IRTS) disposed outside the chamber body adjacent the view port to measure a temperature of the substrate when being processed in the processing volume, the IRTS movable relative to the view port for scanning the substrate through the view port.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: March 16, 2021
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Vinodh Ramachandran, Ananthkrishna Jupudi, Cheng-Hsiung Tsai, Yueh Sheng Ow, Preetham P. Rao, Ribhu Gautam, Prashant Agarwal
  • Publication number: 20210057244
    Abstract: Methods and apparatus for processing a substrate are provided. The apparatus, for example, can include a process chamber comprising a chamber body defining a processing volume and having a view port coupled to the chamber body; a substrate support disposed within the processing volume and having a support surface to support a substrate; and an infrared temperature sensor (IRTS) disposed outside the chamber body adjacent the view port to measure a temperature of the substrate when being processed in the processing volume, the IRTS movable relative to the view port for scanning the substrate through the view port.
    Type: Application
    Filed: August 20, 2019
    Publication date: February 25, 2021
    Inventors: VINODH RAMACHANDRAN, ANANTHKRISHNA JUPUDI, CHENG-HSIUNG TSAI, YUEH SHENG OW, PREETHAM P. RAO, RIBHU GAUTAM, PRASHANT AGARWAL
  • Publication number: 20210059017
    Abstract: Methods and apparatus for processing a substrate are provided herein. The apparatus can include, for example, a microwave energy source configured to provide microwave energy from beneath a substrate support provided in an inner volume of the process chamber; a first microwave reflector positioned on the substrate support above a substrate supporting position of the substrate support; and a second microwave reflector positioned on the substrate support beneath the substrate supporting position, wherein the first microwave reflector and the second microwave reflector are positioned and configured such that microwave energy passes through the second microwave reflector and some of the microwave energy is reflected from a bottom surface of the first microwave reflector back to the substrate during operation.
    Type: Application
    Filed: August 20, 2019
    Publication date: February 25, 2021
    Inventors: TUCK FOONG KOH, YUEH SHENG OW, NUNO YEN-CHU CHEN, ANANTHKRISHNA JUPUDI, PREETHAM P. RAO
  • Publication number: 20200378006
    Abstract: Methods and apparatus for a substrate processing chamber are provided herein. In some embodiments, a substrate processing chamber includes a chamber body having sidewalls defining an interior volume having a polygon shape; a selectively sealable elongated opening disposed in an upper portion of the chamber body for transferring one or more substrates into or out of the chamber body; a funnel disposed at a first end of the chamber body, wherein the funnel increases in size along a direction from an outer surface of the chamber body to the interior volume; and a pump port disposed at a second end of the chamber body opposite the funnel.
    Type: Application
    Filed: May 28, 2019
    Publication date: December 3, 2020
    Inventors: RIBHU GAUTAM, ANANTHKRISHNA JUPUDI, TUCK FOONG KOH, PREETHAM P. RAO, VINODH RAMACHANDRAN, YUEH SHENG OW, YUICHI WADA, CHENG-HSIUNG TSAI, KAI LIANG LIEW
  • Publication number: 20200176290
    Abstract: Methods and apparatus for measuring the temperature of epoxy resin in an electronics package are provided herein. In some embodiments, apparatus for encapsulating an electronics package includes: a process chamber having a chamber body enclosing a processing volume; a substrate support having a support surface for receiving and supporting a substrate for forming an electronics package; and a temperature sensor to measure a temperature of an epoxy resin in an electronics package. The temperature sensor includes: an input apparatus including at least a light source disposed outside the chamber body to provide an excitation light energy to a portion of the epoxy resin; and an output apparatus including at least a signal analyzer disposed outside the chamber body to detect fluorescent light energy emitted by the portion of the epoxy resin and determine a temperature of the epoxy resin based on the excitation light energy and the fluorescent light energy.
    Type: Application
    Filed: February 6, 2020
    Publication date: June 4, 2020
    Inventors: Preetham P. RAO, Ananthkrishna JUPUDI
  • Publication number: 20190385874
    Abstract: Methods and apparatus for controlling gas flow in a process chamber use reconfigurable gas flow plates. The gas flow plates are configured based on at least one processing parameter in the process chamber and then inserted into the process chamber such that a gas flow into an internal volume of the process chamber is controlled by the gas flow plate. The configuration of the gas flow plate may be based on a type of processing, dimensions of the internal volume of the processing chamber, a number of substrates to be processed in the processing chamber, and other parameters. The gas flow plate may include changeable parameters such as a number of through holes, through hole diameters, orientation of through holes, or a position of through holes relative to spacing between substrates.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 19, 2019
    Inventors: PREETHAM P. RAO, MADHUKAR C GULEDGUDD, ANANTHKRISHNA JUPUDI, RIBHU GAUTAM, TUCK FOONG KOH
  • Publication number: 20190326141
    Abstract: Methods and apparatus for reducing leakage of microwaves at a slit valve of a process chamber. A multi-frequency resonant choke around the slit valve prevents microwave energy from a band of frequencies from escaping from the slit valve. The multi-frequency resonant choke may have a sloping bottom surface or a serrated bottom surface to enable multiple frequencies to resonant in the choke, canceling a range of microwave frequencies at gaps formed by a slit valve gate.
    Type: Application
    Filed: March 25, 2019
    Publication date: October 24, 2019
    Inventors: PREETHAM P. RAO, ANANTHKRISHNA JUPUDI, RIBHU GAUTAM