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1929 - On April 12, 1929, inventor Claude A. Hendrickson of Denver, Colorado, applies for a patent for a new type of circulator fan "A ventilator fan comprising a hub provided with a plurality of narrow fan blades that extend radially from the hub, the front sides being flat and inclined to the plane of rotation, the rear sides being convex, the outer end of each blade being provided with a tip that extends from one side thereof, and lies substantially in the plane of rotation". Notable features besides the unusual blade design are a ball bearing motor, supported inside of a motor supporting ring, biased by rubber vibration insulating pads, which results in a quieter running circulator. There are a ceiling mounted circulator, a pedestal circulator, and wall mounted exhaust fans in the production line-up..
