Patents by Inventor Song-Hai Chang

Song-Hai Chang 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).

  • Multi-sectional centrifugal blower fan unit
    Patent number: 5269655
    Abstract: A centrifugal fan assembly consisting of a number of centrifugal fan units. Each of the centrifugal fan units comprises (a) an annular member with a first side and a second side, (b) a number of blades integrating with and extending from said first side, (c) a number of grooves formed in said second side of said annular member, (d) a first device for guiding said blades formed on one centrifugal fan unit to enter in said grooves formed in another centrifugal fan unit even if there is a slight circumferential misalignment of said blades formed on one centrifugal fan unit between said grooves formed in another centrifugal fan unit and (e) a second device for guiding said blades formed on one centrifugal fan unit to enter in said grooves formed in another centrifugal fan unit even if there is a slight radial misalignment of said blades formed on one centrifugal fan unit between said grooves formed in another centrifugal fan unit.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: December 14, 1993
    Inventor: Song-Hai Chang