Patents by Inventor Ping Shan Chen

Ping Shan Chen 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: 20230148470
    Abstract: The present invention provides a lawn mower for cutting grass and maintaining the lawn surface. The lawn mower has a mower deck, a cutting blade driven by a motor, and a blade changing mechanism. The blade changing mechanism includes a fastener for securing the cutting blade to the motor, a blade securement tool for limiting the cutting blade from rotating, and at least one opening on the mower deck for removably receiving the blade securement tool. An edge guide is also provided on the mower deck. The lawn mower also includes a dynamic power management system configured to adjust a rotation speed of the motor dynamically based on a duty condition of the cutting blade.
    Type: Application
    Filed: November 11, 2020
    Publication date: May 18, 2023
    Inventors: Kwok Fan LAM, Kar Tat Wong, Ping Shan Chen
  • Publication number: 20080232670
    Abstract: A method for finding a defective machine comprises the steps of selecting a searching period in which a plurality of wafer lots including good wafer lots and bad wafer lots passes through machines, acquiring a lot-passing information related to the passing sequence of the wafer lots through the machines, calculating a bad-lot continuity by taking the lot-passing information into account, and determining a defective machine by taking the bad-lot continuity into account. The bad-lot continuity is calculated by the steps of determining an impact period based on the aggregation degree of the bad wafer lots, calculating a bad-lot distribution probability in the impact period, and calculating the bad-lot continuity by taking the bad-lot distribution probability into account.
    Type: Application
    Filed: May 10, 2007
    Publication date: September 25, 2008
    Applicant: PROMOS TECHNOLOGIES INC.
    Inventors: Jie Hau Li, Ping Shan Chen