Patents by Inventor Christopher A. Chang

Christopher A. Chang 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: 20240309461
    Abstract: Methods and systems for sample contamination detection are disclosed. In particular, sample barcodes are utilized, wherein each sample barcode is assigned to a sample and ligated to fragments from the sample. The sample barcodes are used in conjunction with indices from sequencing libraries to accurately assign sequence reads to samples during multiplex sequencing. Molecule identifiers may also be utilized to aid in de-duping of sequence reads to precisely identify original NA fragments from a sample. Accordingly, in one or more embodiments, a sequencing method includes isolating DNA fragments in a sample, ligating the DNA fragments with unique molecule identifiers (UMIs), performing an amplification process resulting in amplicons, ligating a sample barcode onto the amplicons, and performing amplicon sequencing. The analytics system looks to whether indices are matched and whether a sample barcode matches to the pair of indices when identifying single-index or double-index hopping events.
    Type: Application
    Filed: March 13, 2024
    Publication date: September 19, 2024
    Inventors: Seyedmedhi Shojaee, Nathan Hunkapiller, Byoungsok Jung, Farnaz Absalan, Chenlu Hou, Sahar Nohzadeh-Malakshah, Christopher Chang
  • Patent number: 12071673
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Grant
    Filed: November 25, 2019
    Date of Patent: August 27, 2024
    Assignee: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Ruchi Mathur, Christopher Chang
  • Publication number: 20240159772
    Abstract: Described herein are methods and systems for detecting and/or distinguishing irritable bowel syndrome (IBS) from inflammatory bowel disease (IBD) and celiac disease. The methods and systems can utilize the detection of anti-CdtB antibodies and/or anti-vinculin antibodies to detect IBS, distinguish IBS from IBD and/or celiac disease. Further described are methods for selecting a therapy to treat IBS, IBD or celiac disease.
    Type: Application
    Filed: May 19, 2023
    Publication date: May 16, 2024
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Christopher Chang
  • Patent number: 11974765
    Abstract: A mouth insert for treating nosebleeds includes a main body and a bite tab. The bite tab removably engages the main body and is configured to move up and/or down vertically in order to adjust the height of the device. The main body includes a horizontally extending elongated portion, a center portion extending downward from a bottom surface of the elongated portion, and the center portion has a narrower width than the horizontally extending elongated portion. The elongated portion of the main body is shaped and dimensioned to be inserted into a buccal cavity of a user's mouth and to fit behind the user's upper lip and in front of the user's upper gums, and the center portion is shaped and dimensioned to be positioned only in front of the user's upper front teeth.
    Type: Grant
    Filed: January 26, 2021
    Date of Patent: May 7, 2024
    Inventors: Matthew James Ibarra, Christopher Chang
  • Patent number: 11915797
    Abstract: In comparison to conventional sequencing pileup algorithms, the process described herein generates sequencing pileups that contains additional information not typically reported by conventional algorithms while also consuming fewer computational resources (e.g., time, processing power, and memory). First, each of a FASTA reference genome and BAM sequence read files are converted to an internal representation. This enables the rapid iteration across nucleotide bases of the sequence reads to determine support characteristics that summarize information of nucleic acid molecules corresponding to positions across the reference genome. Next, the support characteristics of positions across the reference genome are stored through a memory allocation process that utilizes a first and a second temporary storage. This enables the convenient freeing of one temporary storage while the other temporary storage is being used.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: February 27, 2024
    Assignee: Grail, LLC
    Inventor: Christopher Chang
  • Publication number: 20240055073
    Abstract: Methods and systems for detecting contaminated fragments in a biological sample for cancer classification are disclosed. The system identifies CpG-SNP contamination markers. The CpG-SNP contamination markers include at least one SNP that affects a CpG site. The CpG-SNP contamination markers may include additive CpG-SNP sites and/or subtractive CpG-SNP sites. Additive CpG-SNP sites include an SNP that creates a new CpG site. Subtractive CpG-SNP sites include an SNP that removes a preexisting CpG site. Hybrid sites may include additional sites. A multiple CpG-SNP contamination marker comprises two or more CpG-SNP sites. A CpG-SNP & indel contamination marker comprises at least one CpG-SNP site and an indel site. For a given sample, the system identifies contamination markers for which the sample is homozygous. The system determines fragments having a haplotype that is different from the homozygous haplotype of the sample to be contamination fragments.
    Type: Application
    Filed: July 24, 2023
    Publication date: February 15, 2024
    Inventors: Onur Sakarya, Christopher Chang, Ajinkya Kokate, Samuel S. Gross
  • Patent number: 11693009
    Abstract: Described herein are methods and systems for detecting and/or distinguishing irritable bowel syndrome (IBS) from inflammatory bowel disease (IBD) and celiac disease. The methods and systems can utilize the detection of anti-CdtB antibodies and/or anti-vinculin antibodies to detect IBS, distinguish IBS from IBD and/or celiac disease. Further described are methods for selecting a therapy to treat IBS, IBD or celiac disease.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: July 4, 2023
    Assignee: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Christopher Chang
  • Publication number: 20220354925
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Application
    Filed: December 30, 2021
    Publication date: November 10, 2022
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark PIMENTEL, Ruchi MATHUR, Christopher CHANG
  • Publication number: 20220160384
    Abstract: A mouth insert for treating nosebleeds includes a main body and a bite tab. The bite tab removably engages the main body and is configured to move up and/or down vertically in order to adjust the height of the device. The main body includes a horizontally extending elongated portion, a center portion extending downward from a bottom surface of the elongated portion, and the center portion has a narrower width than the horizontally extending elongated portion. The elongated portion of the main body is shaped and dimensioned to be inserted into a buccal cavity of a user's mouth and to fit behind the user's upper lip and in front of the user's upper gums, and the center portion is shaped and dimensioned to be positioned only in front of the user's upper front teeth.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 26, 2022
    Inventors: MATTHEW JAMES IBARRA, CHRISTOPHER CHANG
  • Patent number: 11235022
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: February 1, 2022
    Assignee: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Ruchi Mathur, Christopher Chang
  • Publication number: 20210285042
    Abstract: An allelic position variant calling method using a prior genotype probability at the allelic position is provided. A strand specific base count set in forward and reverse directions for the allelic position is obtained, using strand orientation and identity of a respective base at the allelic position in each respective nucleic acid fragment sequence that maps to the allelic position, where bases at the allelic position whose identity can be affected by conversion of cytosine to uracil do not contribute to the strand specific base count set. Respective forward and reverse strand conditional probabilities are computed for each candidate genotype for the allelic position using the strand specific base count set and sequencing error estimate. Likelihoods are computed using a combination of these conditional probabilities and the prior genotype probability. From this, a determination is made as to whether the likelihoods support a variant call at the allelic position.
    Type: Application
    Filed: February 25, 2021
    Publication date: September 16, 2021
    Inventors: Pranav Singh, Christopher Chang, Collin Melton, Oliver Claude Venn
  • Publication number: 20210065847
    Abstract: Systems and methods for determining consensus base calls in nucleic acid sequencing are provided. A sequencing dataset is obtained corresponding to a plurality of base reads for a first base position within a plurality of base positions of a target nucleic acid molecule. The sequencing dataset includes at least two features, for each base read of the plurality of base reads. The at least two features are selected from among the features: a nucleotide base, a read quality score, a strand identifier, a trinucleotide context of the base read, and a confidence score associated with the trinucleotide context. The sequencing dataset is transformed into a feature tensor representing a distribution of the plurality of features in the sequencing dataset. The feature tensor is assessed with a classifier to determine a consensus base call for the first base position. The consensus base call comprises a predicted nucleotide base.
    Type: Application
    Filed: August 28, 2020
    Publication date: March 4, 2021
    Inventors: Anton Valouev, Shirley Chen, David Burkhardt, Christopher Chang
  • Publication number: 20200360468
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Application
    Filed: May 29, 2020
    Publication date: November 19, 2020
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark PIMENTEL, Ruchi MATHUR, Christopher CHANG
  • Publication number: 20200284804
    Abstract: Described herein are methods and systems for detecting and/or distinguishing irritable bowel syndrome (IBS) from inflammatory bowel disease (IBD) and celiac disease. The methods and systems can utilize the detection of anti-CdtB antibodies and/or anti-vinculin antibodies to detect IBS, distinguish IBS from IBD and/or celiac disease. Further described are methods for selecting a therapy to treat IBS, IBD or celiac disease.
    Type: Application
    Filed: May 18, 2020
    Publication date: September 10, 2020
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Christopher Chang
  • Publication number: 20200271665
    Abstract: Described herein are methods and systems for the detection of anti-vinculin antibodies, for determining a presence or likely presence of a gastrointestinal motility disorder, bladder motility disorder, or fibromyalgia. Further provided are methods of selecting and/or administering a therapy based on the presence or absence of anti-vinculin antibodies.
    Type: Application
    Filed: October 7, 2019
    Publication date: August 27, 2020
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Christopher Chang
  • Publication number: 20200271650
    Abstract: The present invention describes methods for preventing IBS, reducing the likelihood of developing IBS and/or treating IBS by administering CDT inhibitors and/or CDT neutralizers to a subject in need thereof. The present invention also describes methods of eliciting a specific immune response and methods of vaccinating a subject to prevent IBS or to reduce the likelihood of developing or having IBS. The present invention further describes methods of diagnosing IBS by detecting the presence or absence of CDT or a CDT marker in a subject.
    Type: Application
    Filed: January 6, 2020
    Publication date: August 27, 2020
    Applicant: CEDARS-SINAI MEDICAL CENTER
    Inventors: Mark Pimentel, Christopher Chang
  • Patent number: 10735860
    Abstract: There is provided an apparatus which can include a plurality of speaker drivers and a control processor. The control processor can be configured to flexibly group the speaker drivers. The control processor can be further configured to perform the tasks of controlling directivity of audio output from at least one group and providing time delay to audio output from at least one speaker driver from at least one controlled group so as to generate at least one sound field associable with a dispersed profile.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: August 4, 2020
    Assignee: Creative Technology Ltd
    Inventors: Thean Kuie Christopher Chang, Kok Huan Ong
  • Patent number: 10688149
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: June 23, 2020
    Assignee: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Ruchi Mathur, Christopher Chang
  • Patent number: 10690679
    Abstract: Described herein are methods and systems for distinguishing irritable bowel syndrome (IBS) from inflammatory bowel disease (IBD) and celiac disease. The methods and systems can utilize the detection of anti-vinculin antibodies and anti-CdtB antibodies to distinguish IBS from IBD and celiac disease. Further described are methods for selecting a therapy to treat IBS, IBD or celiac disease.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: June 23, 2020
    Assignee: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Christopher Chang
  • Publication number: 20200087711
    Abstract: The invention described herein provides for methods and systems for determining, selecting, and/or treating diseases and conditions caused by or associated with high quantities of methanogens in a subject, or diseases and conditions caused by or associated with low quantities of methanogens in a subject. In various embodiments, a therapy to inhibit the growth of methanogens or to promote the growth of methanogens are selected and/or administered to a subject in need thereof.
    Type: Application
    Filed: November 25, 2019
    Publication date: March 19, 2020
    Applicant: Cedars-Sinai Medical Center
    Inventors: Mark Pimentel, Ruchi Mathur, Christopher Chang