Patents by Inventor Amol Joshi

Amol Joshi 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).

  • Publication number: 20110175158
    Abstract: A dual node memory device and methods for fabricating the device are provided. In one embodiment the method comprises forming a layered structure with an insulator layer, a charge storage layer, a buffer layer, and a sacrificial layer on a semiconductor substrate. The layers are patterned to form two spaced apart stacks and an exposed substrate portion between the stacks. A gate insulator and a gate electrode are formed on the exposed substrate, and the sacrificial layer and buffer layer are removed. An additional insulator layer is deposited overlying the charge storage layer to form insulator-storage layer-insulator memory storage areas on each side of the gate electrode. Sidewall spacers are formed at the sidewalls of the gate electrode overlying the storage areas. Bit lines are formed in the substrate spaced apart from the gate electrode, and a word line is formed that contacts the gate electrode and the sidewall spacers.
    Type: Application
    Filed: March 29, 2011
    Publication date: July 21, 2011
    Inventors: Chungho LEE, Hiroyuki KINOSHITA, Kuo-Tung CHANG, Amol JOSHI, Kyunghoon MIN, Chi CHANG
  • Patent number: 7915123
    Abstract: A dual node memory device and methods for fabricating the device are provided. In one embodiment the method comprises forming a layered structure with an insulator layer, a charge storage layer, a buffer layer, and a sacrificial layer on a semiconductor substrate. The layers are patterned to form two spaced apart stacks and an exposed substrate portion between the stacks. A gate insulator and a gate electrode are formed on the exposed substrate, and the sacrificial layer and buffer layer are removed. An additional insulator layer is deposited overlying the charge storage layer to form insulator-storage layer-insulator memory storage areas on each side of the gate electrode. Sidewall spacers are formed at the sidewalls of the gate electrode overlying the storage areas. Bit lines are formed in the substrate spaced apart from the gate electrode, and a word line is formed that contacts the gate electrode and the sidewall spacers.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: March 29, 2011
    Assignee: Spansion LLC
    Inventors: Chungho Lee, Hiroyuki Kinoshita, Kuo-Tung Chang, Amol Joshi, Kyunghoon Min, Chi Chang
  • Patent number: 7564091
    Abstract: A semiconductor memory device and a method for its fabrication are provided. In accordance with one embodiment of the invention the method comprises the steps of forming a gate insulator and a gate electrode overlying a semiconductor substrate. The gate insulator is etched to form an undercut opening beneath an edge of the gate electrode and the undercut opening is filled with a layered structure comprising a charge trapping layer sandwiched between layers of oxide and nitride. A region of the semiconductor substrate is impurity doped to form a bit line aligned with the gate electrode, and a conductive layer is deposited and patterned to form a word line coupled to the gate electrode.
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: July 21, 2009
    Assignee: Spansion LLC
    Inventors: Chungho Lee, Ashot Melik-Martirosian, Hiroyuki Kinoshita, Kuo-Tung Chang, Amol Joshi, Meng Ding
  • Publication number: 20080315290
    Abstract: A semiconductor memory device and a method for its fabrication are provided. In accordance with one embodiment of the invention the method comprises the steps of forming a gate insulator and a gate electrode overlying a semiconductor substrate. The gate insulator is etched to form an undercut opening beneath an edge of the gate electrode and the undercut opening is filled with a layered structure comprising a charge trapping layer sandwiched between layers of oxide and nitride. A region of the semiconductor substrate is impurity doped to form a bit line aligned with the gate electrode, and a conductive layer is deposited and patterned to form a word line coupled to the gate electrode.
    Type: Application
    Filed: August 27, 2008
    Publication date: December 25, 2008
    Inventors: Chungho LEE, Ashot Melik-Martirosian, Hiroyuki Kinoshita, Kuo-Tung Chang, Amol Joshi, Meng Ding
  • Patent number: 7432156
    Abstract: A semiconductor memory device and a method for its fabrication are provided. In accordance with one embodiment of the invention the method comprises the steps of forming a gate insulator and a gate electrode overlying a semiconductor substrate. The gate insulator is etched to form an undercut opening beneath an edge of the gate electrode and the undercut opening is filled with a layered structure comprising a charge trapping layer sandwiched between layers of oxide and nitride. A region of the semiconductor substrate is impurity doped to form a bit line aligned with the gate electrode, and a conductive layer is deposited and patterned to form a word line coupled to the gate electrode.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: October 7, 2008
    Assignee: Spansion LLC
    Inventors: Chungho Lee, Ashot Melik-Martirosian, Hiroyuki Kinoshita, Kuo-Tung Chang, Amol Joshi, Meng Ding
  • Publication number: 20080079061
    Abstract: According to one exemplary embodiment, a structure, for example a flash memory cell, comprises a transistor gate dielectric stack situated on a semiconductor substrate. The transistor gate dielectric stack includes a bottom oxide layer, a silicon-rich nitride layer situated on the bottom oxide layer, a low silicon-rich nitride layer situated on the silicon-rich nitride layer, and a top oxide layer situated on the low silicon-rich nitride layer. This embodiment results in a nitride based flash memory cell having improved program speed and retention while maintaining a high erase speed. In another embodiment, a flash memory cell may further comprise a high-K dielectric layer situated on the transistor gate dielectric stack.
    Type: Application
    Filed: September 28, 2006
    Publication date: April 3, 2008
    Inventors: Meng Ding, Amol Joshi, Takashi Orimoto, Jayendra Bhakta, Lei Xue, Satoshi Torii, Robert Bertram Ogle
  • Publication number: 20070077754
    Abstract: A contact structure in a semiconductor device includes a layer of dielectric material and a via formed through the dielectric material. The contact structure further includes a spacer formed on sidewalls of the via using atomic layer deposition (ALD) and a metal deposited in the via.
    Type: Application
    Filed: October 3, 2005
    Publication date: April 5, 2007
    Inventors: Minh Ngo, Angela Hui, Amol Joshi, Wenmei Li, Ning Cheng, Ankur Agarwal, Norimitsu Takagi
  • Patent number: 7024364
    Abstract: A system, method and computer program product for determining an address of an entity based on a user location are disclosed. An utterance representative of an entity is initially received from a user. The entity associated with the utterance is then recognized using a speech recognition process. Next, a location of the user is determined. A query is performed to identify a plurality of locations associated with the entity. Based on the results of the query and the location of the user, it is ascertained which of the identified locations associated with the entity are in proximity to the location of the user.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: April 4, 2006
    Assignee: BeVocal, Inc.
    Inventors: Lisa M. Guerra, Mikael Berner, Kevin Stone, Amol Joshi, Steve Tran
  • Publication number: 20020169611
    Abstract: A system, method and computer program product for determining an address of an entity based on a user location are disclosed. An utterance representative of an entity is initially received from a user. The entity associated with the utterance is then recognized using a speech recognition process. Next, a location of the user is determined. A query is performed to identify a plurality of locations associated with the entity. Based on the results of the query and the location of the user, it is ascertained which of the identified locations associated with the entity are in proximity to the location of the user.
    Type: Application
    Filed: March 9, 2001
    Publication date: November 14, 2002
    Inventors: Lisa M. Guerra, Mikael Berner, Kevin Stone, Amol Joshi, Steve Tran