Patents by Inventor WeiLing Ma

WeiLing Ma 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: 20100302052
    Abstract: The invention involves an intellectualized polarity identification device which comprises an electromagnetic module connected with a control circuit. The electromagnetic module comprises a magnetic inductor (electromagnet), a movable contact plate coaxially set with the magnetic inductor (electromagnet) and stationary contact plates. The control circuit comprises a reversed-polarity alarm protecting circuit connected with a correct-polarity conducting circuit. The reversed-polarity alarm protecting circuit comprises an alarm circuit and a protection circuit, the protection circuit comprising a diode and a photocoupler. The correct-polarity conducting circuit comprises a conduction circuit and an indicator circuit, respectively connected with the photocoupler. The intellectualized polarity identification device is electromagnetically controlled such that a closed circuit is created only when the device is connected with the correct polarity.
    Type: Application
    Filed: February 9, 2010
    Publication date: December 2, 2010
    Applicant: SHANGHAI GUANGWEI ELECTRIC & TOOLS CO., LTD.
    Inventors: YePing Fan, ZhiLiang Jiang, WeiLing Ma, ZhongRen Zhang