Patents by Inventor Daniel L. Cheung

Daniel L. Cheung 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).

  • Method, apparatus and computer program for migrating records in a database from a source database schema to a target database schema
    Patent number: 10380085
    Abstract: There is disclosed a system for migrating records in a database from a source database schema to a target database schema. A request is received to delete a state from the source schema. The state is marked as the redundant state. A resultant state is identified to which to migrate database records in the redundant state and a valid migration path is calculated between the redundant state and the resultant state.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: August 13, 2019
    Assignee: International Business Machines Corporation
    Inventors: Daniel L. Cheung, Sanjay Nagchowdhury, John A. Owen
  • SYSTEM FOR MIGRATING RECORDS IN A DATABASE FROM A SOURCE DATABASE SCHEMA TO A TARGET DATABASE SCHEMA
    Publication number: 20170024383
    Abstract: There is disclosed a system for migrating records in a database from a source database schema to a target database schema. A request is received to delete a state from the source schema. The state is marked as the redundant state. A resultant state is identified to which to migrate database records in the redundant state and a valid migration path is calculated between the redundant state and the resultant state.
    Type: Application
    Filed: October 5, 2016
    Publication date: January 26, 2017
    Inventors: Daniel L. Cheung, Sanjay Nagchowdhury, John A. Owen
  • Method, apparatus and computer program for migrating records in a database from a source database schema to a target database schema
    Patent number: 9471608
    Abstract: There is disclosed a method, apparatus and computer program for migrating records in a database from a source database schema to a target database schema. A request is received to delete a state from the source schema. The state is marked as the redundant state. A resultant state is identified to which to migrate database records in the redundant state and a valid migration path is calculated between the redundant state and the resultant state.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: October 18, 2016
    Assignee: International Busines Machines Corporation
    Inventors: Daniel L. Cheung, Sanjay Nagchowdhury, John A. Owen
  • METHOD, APPARATUS AND COMPUTER PROGRAM FOR MIGRATING RECORDS IN A DATABASE FROM A SOURCE DATABASE SCHEMA TO A TARGET DATABASE SCHEMA
    Publication number: 20090106285
    Abstract: There is disclosed a method, apparatus and computer program for migrating records in a database from a source database schema to a target database schema. A request is received to delete a state from the source schema. The state is marked as the redundant state. A resultant state is identified to which to migrate database records in the redundant state and a valid migration path is calculated between the redundant state and the resultant state.
    Type: Application
    Filed: October 16, 2008
    Publication date: April 23, 2009
    Inventors: Daniel L. Cheung, Sanjay Nagchowdhury, John A. Owen