Patents by Inventor David Q. Dong

David Q. Dong 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).

  • Tachometer and rotor identification system for centrifuges
    Patent number: 5383838
    Abstract: A centrifuge rotor overspeed protection system which can operate with rotors of at least two speed ranges. A set of coding elements are provided on the rotors coded to represent the actual maximum safe speed rating of the rotor. An additional set of coding elements coded to correspond to the maximum speed in the lower speed range are also provided such that the rotor can be operated at the maximum speed possible in a prior art centrifuge designed for operation in the lower speed range. The detection circuit for the coding elements automatically adjusts the detection threshold depending on the average values of the sensor output peaks corresponding to the codes.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: January 24, 1995
    Assignee: Beckman Instruments, Inc.
    Inventors: David W. Cheng, David Q. Dong