Patents by Inventor Swee Wong

Swee Wong 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).

  • Cryogenic apparatus
    Patent number: 5275016
    Abstract: The present invention provides methods and devices for freezing drops of liquid reagent solution in a cryogenic liquid. In one embodiment, the apparatus of the present invention comprises means for dispensing uniform, precisely measured drops of a liquid reagent and a rotatable carousel positioned below the dispensing means. The upper surface of the carousel has a plurality of trays each containing a cryogenic liquid, typically liquid nitrogen, for receiving the drops of liquid reagent. An alternative embodiment of the present invention comprises a tank comprising a cryogenic liquid for receiving the drops of liquid reagent. The tank has a heat source for slightly heating a portion of the cryogenic liquid such that a convection current in the cryogenic liquid is created. The convection currents in the cryogenic liquid provide mild agitation of the liquid and prevent aggregation of the frozen drops.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: January 4, 1994
    Assignee: Abaxis, Inc.
    Inventors: Bikash K. Chatterjee, Steven N. Buhl, Chi-Sou Yu, Thuy N. Tang, Gary L. Smith, Bhaskar Bhayani, Anthony Alvarado, Swee Wong