×

Fan scroll

  • US 6,142,732 A
  • Filed: 05/26/1998
  • Issued: 11/07/2000
  • Est. Priority Date: 05/26/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A fan having a housing;

  • said housing having an outlet;

    a blower located in said housing;

    said housing having a radially increasing section surrounding said blower and defining a flow path therewith;

    a cutoff located in said housing and coacting with said blower to define the closest radial separation between said blower and any surrounding structure;

    a flow path defined between said blower and said radially increasing section starting at said cutoff and extending for at least 360°

    starting from said cutoff;

    means for sensing noise located at a location at least 300°

    along said flow path; and

    means for producing a noise canceling signal at a location at least 360°

    along said flow path.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×