Patents by Inventor Dana Lee

Dana Lee 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: 10083069
    Abstract: A data storage device includes a non-volatile memory and a controller. The non-volatile memory includes a word line coupled to a plurality of storage elements. A method includes detecting a condition associated with a defect in the word line. A first subset of the plurality of storage elements and a second subset of the plurality of storage elements are determined based on an estimated location of the defect. The method further includes determining a first read threshold for the first subset and a second read threshold for the second subset.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: September 25, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Seungjune Jeon, Idan Alrod, Eran Sharon, Dana Lee
  • Publication number: 20180253351
    Abstract: A device includes a memory device and a controller. The memory device includes read/write circuitry and a plurality of memory dies. The controller is coupled to the memory device. The controller is configured to, responsive to determining that at least one storage element of a first die of the plurality of memory dies has a characteristic indicative of an aging condition, increase the temperature of the first die by performing memory operations on the first die until detecting a condition related to the temperature.
    Type: Application
    Filed: May 3, 2018
    Publication date: September 6, 2018
    Inventors: Preeti YADAV, Prasanna Desai Sudhir RAO, Smita AGGARWAL, Dana LEE
  • Patent number: 10056399
    Abstract: A three-dimensional memory device includes a first alternating stack of first insulating layers and first electrically conductive layers, a first memory opening fill structure extending through the first alternating stack and including a first memory film and a first vertical semiconductor channel, a joint-level electrically conductive layer overlying the first alternating stack, at least one joint-level doped semiconductor portion contacting a top surface of the first vertical semiconductor channel and located within, and electrically isolated from, the joint-level electrically conductive layer, a second alternating stack of second insulating layers and second electrically conductive layers located over the joint-level electrically conductive layer, and a second memory opening fill structure extending through the second alternating stack and including a second memory film and a second vertical semiconductor channel that is laterally surrounded by the second memory film and vertically extends into the at leas
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: August 21, 2018
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Xiying Costa, Daxin Mao, Christopher Petti, Dana Lee, Yao-Sheng Lee
  • Publication number: 20180182771
    Abstract: A three-dimensional memory device includes a first alternating stack of first insulating layers and first electrically conductive layers, a first memory opening fill structure extending through the first alternating stack and including a first memory film and a first vertical semiconductor channel, a joint-level electrically conductive layer overlying the first alternating stack, at least one joint-level doped semiconductor portion contacting a top surface of the first vertical semiconductor channel and located within, and electrically isolated from, the joint-level electrically conductive layer, a second alternating stack of second insulating layers and second electrically conductive layers located over the joint-level electrically conductive layer, and a second memory opening fill structure extending through the second alternating stack and including a second memory film and a second vertical semiconductor channel that is laterally surrounded by the second memory film and vertically extends into the at leas
    Type: Application
    Filed: February 28, 2017
    Publication date: June 28, 2018
    Inventors: Xiying Costa, Daxin Mao, Christopher Petti, Dana Lee, Yao-Sheng Lee
  • Publication number: 20180173447
    Abstract: Apparatuses, systems, methods, and computer program products are disclosed for dynamic read table generation. One apparatus includes a set of non-volatile storage cells. A controller for a set of non-volatile storage cells is configured to, in response to unsuccessfully reading a storage cell of the set of non-volatile storage cells using a parameter, read the storage cell using one or more shifted values. A controller for a set of non-volatile storage cells is configured to, in response to successfully reading a storage cell using one or more shifted values, add the one or more shifted values to a storage device.
    Type: Application
    Filed: December 16, 2016
    Publication date: June 21, 2018
    Applicant: SanDisk Technologies LLC
    Inventors: Henry Chin, Sateesh Desireddi, Dana Lee, Ashwin D T, Harshul Gupta, Parth Amin, Jia Li
  • Publication number: 20180156321
    Abstract: A roller assembly for a hood actuation system includes a mounting block and a fastener having a shaft extending through the mounting block. The fastener is configured to couple the mounting block to an actuator of the hood actuation system. The roller assembly also includes at least one driving roller. The shaft of the fastener extends through an opening in the at least one driving roller to couple the at least one driving roller to the mounting block.
    Type: Application
    Filed: December 5, 2016
    Publication date: June 7, 2018
    Inventors: Dana Lee Froemming, Michael Sylvester Bares, Jonathan Richard Nistler, Christopher Jerel Brosz
  • Patent number: 9983922
    Abstract: A device includes a memory device and a controller. The memory device includes read/write circuitry and a plurality of memory dies. The controller is coupled to the memory device. The controller is configured to, responsive to determining that at least one storage element of a first die of the plurality of memory dies has a characteristic indicative of an aging condition, increase the temperature of the first die by performing memory operations on the first die until detecting a condition related to the temperature.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: May 29, 2018
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Preeti Yadav, Prasanna Desai Sudhir Rao, Smita Aggarwal, Dana Lee
  • Publication number: 20180143788
    Abstract: A device includes a memory device and a controller. The controller is coupled to the memory device. The controller is configured to, in response to receiving a request to perform a memory access at the memory device, determine that the memory device has a characteristic indicative of a temperature crossing. The controller is also configured to, in response to the determination, increase a temperature of the memory device by performing memory operations on the memory device until detecting a condition related to the temperature.
    Type: Application
    Filed: January 22, 2018
    Publication date: May 24, 2018
    Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Preeti Yadav, Prasanna Desai Sudhir Rao, Smita Aggarwal, Dana Lee
  • Publication number: 20180143772
    Abstract: A device includes a memory device and a controller. The controller is coupled to the memory device. The controller is configured to, in response to receiving a request to perform a memory access at the memory device, determine that the memory device has a characteristic indicative of a temperature crossing. The controller is also configured to, in response to determining that the memory device has the characteristic indicative of the temperature crossing, determine that the memory device satisfies an availability criterion. The controller is further configured to, in response to determining that the memory device satisfies the availability criterion, increase a temperature of the memory device by performing memory operations on the memory device until detecting a condition related to the temperature.
    Type: Application
    Filed: January 20, 2018
    Publication date: May 24, 2018
    Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: PHILIP DAVID REUSSWIG, NIAN NILES YANG, GRISHMA SHAH, DEEPAK RAGHU, PREETI YADAV, PRASANNA DESAI SUDHIR RAO, SMITA AGGARWAL, DANA LEE
  • Patent number: 9978456
    Abstract: Techniques are presented to reduce the amount of read disturb on partially written blocks of NAND type non-volatile memory, both for when determining the last written word line in a block and also for data read. In both cases, non-selected word lines that are unwritten or, in the case of finding the last written word line, may be unwritten are biased with a lower read-pass voltage then is typically used. The result of such reads can also be applied to an algorithm for finding the last written word by skipping a varying number of word lines. Performance in a last written page determination can also be improved by use of shorter bit line settling times than for a standard read.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: May 22, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Anubhav Khandelwal, Dana Lee, Abhijeet Manohar, Henry Chin, Gautam Dusija, Daniel Tuers, Chris Avila, Cynthia Hsu
  • Patent number: 9892790
    Abstract: A split gate NAND flash memory structure is formed on a semiconductor substrate of a first conductivity type. The NAND structure comprises a first region of a second conductivity type in the substrate with a second region of the second conductivity type in the substrate, spaced apart from the first region. A continuous first channel region is defined between the first region and the second region. A plurality of floating gates are spaced apart from one another with each positioned over a separate portion of the channel region. A plurality of control gates are provided with each associated with and adjacent to a floating gate. Each control gate has two portions: a first portion over a portion of the channel region and a second portion over the associated floating gate and capacitively coupled thereto.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: February 13, 2018
    Assignee: Silicon Storage Technology, Inc.
    Inventors: Yuniarto Widjaja, John W. Cooksey, Changyuan Chen, Feng Gao, Ya-Fen Lin, Dana Lee
  • Patent number: 9880752
    Abstract: A device includes a memory device and a controller. The controller is coupled to the memory device. The controller is configured to, in response to receiving a request to perform a memory access at the memory device, determine that the memory device has a characteristic indicative of a temperature crossing. The controller is also configured to, in response to determining that the memory device has the characteristic indicative of the temperature crossing, determine that the memory device satisfies an availability criterion. The controller is further configured to, in response to determining that the memory device satisfies the availability criterion, increase a temperature of the memory device by performing memory operations on the memory device until detecting a condition related to the temperature.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: January 30, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Philip David Reusswig, Nian Niles Yang, Grishma Shah, Deepak Raghu, Preeti Yadav, Prasanna Desai Sudhir Rao, Smita Aggarwal, Dana Lee
  • Patent number: 9875062
    Abstract: A device includes a memory device and a controller. The controller is coupled to the memory device. The controller is configured to, in response to receiving a request to perform a memory access at the memory device, determine that the memory device has a characteristic indicative of a temperature crossing. The controller is also configured to, in response to the determination, increase a temperature of the memory device by performing memory operations on the memory device until detecting a condition related to the temperature.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: January 23, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Preeti Yadav, Prasanna Desai Sudhir Rao, Smita Aggarwal, Dana Lee
  • Publication number: 20170345510
    Abstract: A device includes a memory and a controller coupled to the memory. The controller is configured to determine a temperature-based value of a search parameter in response to detecting that an error rate of a codeword read from the memory exceeds a threshold error rate. The controller is further configured to iteratively modify one or more memory access parameters associated with reducing temperature-dependent threshold voltage variation and to re-read the codeword using the modified one or more memory access parameters.
    Type: Application
    Filed: June 9, 2017
    Publication date: November 30, 2017
    Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
  • Patent number: 9805809
    Abstract: Apparatuses, systems, methods, and computer program products are disclosed for state-dependent read compensation. A set of non-volatile storage cells comprising a plurality of word lines. A controller is configured to perform a read operation on one or more word lines adjacent to a target word line. A controller is configured to determine a read setting for application to a target word line based on a result of a read operation on one or more word lines adjacent to the target word line. A controller is configured to perform a read operation on a target word line using a determined read setting.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: October 31, 2017
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Zhenming Zhou, Guirong Liang, Gerrit Jan Hemink, Dana Lee, Chandu Gorla, Sarath Puthenthermadam, Deepanshu Dutta
  • Patent number: 9785357
    Abstract: Systems and methods for sampling data at a non-volatile memory system are disclosed. In one implementation, a controller of a non-volatile memory system that is coupled with a host device acquires a read level voltage of a first word line of a memory block of a non-volatile memory of the non-volatile memory system. The controller accesses one or more lookup tables to determine an offset voltage for a second word line of the memory block based on a program/erase count and a read/disturb count associated with the memory block; applies the read level voltage and the offset voltage to the second word line to sample data stored at the memory block; and determines whether the data sampled from the memory block contains errors.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: October 10, 2017
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Deepak Raghu, Chris Aviala, Harish Singidi, Guirong Liang, Anne Pao-Ling Koh, Dana Lee, Gautam Dusija
  • Patent number: 9720769
    Abstract: A method of operating a data storage device having a memory includes reading error location data associated with a first region of the memory. The memory includes the first region and a second region. The method also includes generating one or more parameters based on the error location data. The method includes receiving data to be written to the memory and encoding the data to produce a codeword. The method also includes partitioning the codeword based on the one or more parameters to generate a first portion and a second portion. The method further includes performing a write operation to store the first portion at the first region and to store the second portion at the second region.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: August 1, 2017
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Abhijeet Manohar, Daniel Edward Tuers, Dana Lee
  • Publication number: 20170210706
    Abstract: A method of making CF3CH2SH, comprising a step of reacting CF3CH2X, wherein X is halide or tosylate, with MSH, where M is an alkali metal such as Na or K, to yield CF3CH2SH. More specifically, a method of making CF3CH2SH, a step of reacting CF3CH2CI with a molar excess of NaSH in a reaction medium of one or more polar organic solvents at a temperature of from about 70 C to about 110 C for a time of from about 1 to about 5 hours.
    Type: Application
    Filed: July 31, 2015
    Publication date: July 27, 2017
    Inventors: Robert George Syvret, Craig Alan Polsz, Dana Lee Swan, Vijay R. Srinivas
  • Patent number: 9710325
    Abstract: Techniques for efficiently programming non-volatile storage are disclosed. A second page of data may efficiently be programmed into memory cells that already store a first page. Data may be efficiently transferred from single bit cells to multi-bit cells. Memory cells are read using at least two different read levels. The results are compared to determine a count how many memory cells showed a different result between the two reads. If the count is less than a threshold, then data from the memory cells is stored into a set of data latches without attempting to correct for misreads. If the count is not less than the threshold, then data from the memory cells is stored into the set of data latches with attempting to correct for misreads. A programming operation may be performed based on the data stored in the set of data latches.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: July 18, 2017
    Assignee: SanDisk Technologies LLC
    Inventors: Wenzhou Chen, Zhenming Zhou, Jun Wan, Deepanshu Dutta, Yi-Chieh Chen, Dana Lee
  • Patent number: 9633738
    Abstract: A storage system includes a controller that is configured to make host data inaccessible. To do so, the controller may control power control circuitry to supply pulses to storage locations storing host data. The pulses may include flash write pulses but no erase pulses, or a combination of flash write pulses and erase pulses. If erase pulses are supplied, the number of the erase pulses may be less than the number supplied for performance of a default erase operation.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: April 25, 2017
    Assignee: SanDisk Technologies LLC
    Inventors: Zelei Guo, Pao-Ling Koh, Henry Chin, Pitamber Shukla, Deepak Raghu, Dana Lee