Patents by Inventor Chunhao Zhang

Chunhao Zhang 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).

  • IN-SITU INVERTER CAPACITANCE ANALYSES AND DEGRADATION ALERTS USING VARIABLE OPERATIONAL MODES OF ELECTRIC MOTOR
    Publication number: 20240171111
    Abstract: Apparatus and techniques for analyzing a capacitance value in an electric motor inverter are disclosed. A processor is coupled to a DC-AC inverter, which includes a capacitor across its terminals and is powered by a battery. The processor performs resistor switching to enable singular, periodic measurement of the capacitance. The measured value is compared with a nominal or beginning of life (BOL) value. An alert may be sent if the capacitance has degraded beyond a threshold. In other aspects, the DC torque ripple envelop is used to measure capacitance. The outcome is compared with the other tests to assess consistency. An inconsistent outcome may identify potential resistor degradation.
    Type: Application
    Filed: November 18, 2022
    Publication date: May 23, 2024
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Muhammad H. Alvi, Khorshed Mohammed Alam, Jiyu Zhang, Chunhao J. Lee, Brian A. Welchko
  • Scalable process for the preparation of a rapamycin 42-ester from a rapamycin 42-ester boronate
    Patent number: 7622578
    Abstract: A scalable process for the preparation of a rapamycin 42-ester by reacting a rapamycin 42-ester boronate with a diol and purifying crude rapamycin 42-ester by recrystallization and treatment with a diol is provided. Also provided is a method for isolating and purifying a rapamycin 42-ester boronate from mother liquors comprising acetone and rapamycin contaminants.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: November 24, 2009
    Assignee: Wyeth
    Inventors: Chunhao Zhang, Clifford William Coughlin, Anthony Pilcher, Adam P. Michaud, James S. Farina, Ayman Sahli
  • Process for the preparation of purified crystalline CCI-779
    Patent number: 7553843
    Abstract: The present invention provides purified crystalline CCI-779 and processes for preparing the same.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: June 30, 2009
    Assignee: Wyeth
    Inventors: Subodh S. Deshmukh, Clifford William Coughlin, Chunhao Zhang, Adam P. Michaud, Lynn M. Phelan, Wei Tong
  • Process for the preparation of purified crystalline CCI-779
    Publication number: 20070129395
    Abstract: The present invention provides purified crystalline CCI-779 and processes for preparing the same.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 7, 2007
    Applicant: Wyeth
    Inventors: Subodh Deshmukh, Clifford Coughlin, Chunhao Zhang, Adam Michaud, Lynn Phelan, Wei Tong
  • Scalable process for the preparation of a rapamycin 42-ester from a rapamycin 42-ester boronate
    Publication number: 20070129541
    Abstract: A scalable process for the preparation of a rapamycin 42-ester by reacting a rapamycin 42-ester boronate with a diol and purifying crude rapamycin 42-ester by recrystallization and treatment with a diol is provided. Also provided is a method for isolating and purifying a rapamycin 42-ester boronate from mother liquors comprising acetone and rapamycin contaminants.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 7, 2007
    Applicant: Wyeth
    Inventors: Chunhao Zhang, Clifford Coughlin, Anthony Pilcher, Adam Michaud, James Farina, Ayman Sahli