Patents by Inventor Hubert Chan

Hubert Chan 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).

  • Privacy-preserving aggregation of Time-series data
    Patent number: 8555400
    Abstract: A private stream aggregation (PSA) system contributes a user's data to a data aggregator without compromising the user's privacy. The system can begin by determining a private key for a local user in a set of users, wherein the sum of the private keys associated with the set of users and the data aggregator is equal to zero. The system also selects a set of data values associated with the local user. Then, the system encrypts individual data values in the set based in part on the private key to produce a set of encrypted data values, thereby allowing the data aggregator to decrypt an aggregate value across the set of users without decrypting individual data values associated with the set of users, and without interacting with the set of users while decrypting the aggregate value. The system also sends the set of encrypted data values to the data aggregator.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: October 8, 2013
    Assignee: Palo Alto Research Center Incorporated
    Inventors: Runting Shi, Richard Chow, Tsz Hong Hubert Chan
  • PRIVACY-PRESERVING AGGREGATION OF TIME-SERIES DATA
    Publication number: 20120204026
    Abstract: A private stream aggregation (PSA) system contributes a user's data to a data aggregator without compromising the user's privacy. The system can begin by determining a private key for a local user in a set of users, wherein the sum of the private keys associated with the set of users and the data aggregator is equal to zero. The system also selects a set of data values associated with the local user. Then, the system encrypts individual data values in the set based in part on the private key to produce a set of encrypted data values, thereby allowing the data aggregator to decrypt an aggregate value across the set of users without decrypting individual data values associated with the set of users, and without interacting with the set of users while decrypting the aggregate value. The system also sends the set of encrypted data values to the data aggregator.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 9, 2012
    Applicant: PALO ALTO RESEARCH CENTER INCORPORATED
    Inventors: Runting Shi, Richard Chow, Tsz Hong Hubert Chan
  • Method for determining unique write inhibit thresholds for individual heads for maximizing file servo performance
    Patent number: 7209305
    Abstract: A method for determining a write inhibit threshold value for at least one head of a file during the file manufacturing process is disclosed. The method includes qualifying a test track for use in the determining of the write inhibit threshold value. The method further includes performing a write inhibit threshold determination process to obtain the write inhibit threshold value and then storing the write inhibit threshold value for use with the at least one head of the file.
    Type: Grant
    Filed: January 6, 2005
    Date of Patent: April 24, 2007
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Hin-Ching Hubert Chan, Joseph Emanuel Silva, Thomas Stanley, Yue Ming Tang