# US 2019/0316602 A1 · Fan configured to produce pink noise > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0316602 A1 - Document ID: US20190316602A1 - Status: Published application - Kind: A1 - Application number: 16/378,705 - Filed: 2019-04-09 - Published: 2019-10-17 - Earliest claimed: 2018-04-11 - Assignees: Helen of Troy Limited - Applicants: Helen of Troy Limited - Inventors: Michael Singleton; Brett Mikolajczyk - Web page: https://patentgrep.com/patent/US20190316602A1 ## CPC - F04D 25/08: the working fluid being air, e.g. for ventilation - F04D 29/666: {by means of rotor construction or layout, e.g. unequal distribution of blades or vanes} - F04D 19/002: {Axial flow fans} - F04D 29/282: {the leading edge of each vane being substantially parallel to the rotation axis} - F04D 29/30: Vanes - F04D 29/4226: {Fan casings} - F04D 29/663: {Sound attenuation} - G10K 15/04: Sound-producing devices (G10K15/02 takes precedence) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## Abstract A fan is provided that includes a fan blade movable relative to a housing. The housing and the fan blade are configured such that the fan generates a pink noise sound profile both when air is exiting the fan housing through an air outlet vent and when air is not exiting the housing through the outlet air vent ## Claims ### Claim 1 A fan comprising a fan blade movable relative to a housing, the housing and the fan blade being configured such that the fan generates a pink noise sound profile both when air is exiting the housing through an outlet air vent and when air is not exiting the housing through the outlet air vent. ### Claim 2 (depends on 1) The fan of claim 1, wherein the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being open allowing air to exit the housing through the outlet air vent and the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being closed precluding air to exit the housing through the outlet air vent. ### Claim 3 (depends on 2) The fan of claim 2, further comprising a shutter movable relative to the housing between an open position and a closed position, wherein the outlet air vent is open allowing air to exit the housing through the outlet air vent when the shutter is in the open position and the outlet air vent is covered precluding air to exit the housing through the outlet air vent when the shutter is in the closed position. ### Claim 4 (depends on 1) The fan of claim 1, further comprising a shutter movable relative to the housing between an open position and a closed position, wherein the outlet air vent is open allowing air to exit the housing through the outlet air vent when the shutter is in the open position and the outlet air vent is covered precluding air to exit the housing through the outlet air vent when the shutter is in the closed position ### Claim 5 (depends on 1) The fan of claim 1, further comprising a speaker in communication a pink noise generation device. ### Claim 6 (depends on 5) The fan of claim 5, wherein the speaker is in wireless communication with the pink noise generation device. ### Claim 7 (depends on 6) The fan of claim 6, wherein the speaker is configured to generate the pink noise sound profile. ### Claim 8 (depends on 1) The fan of claim 1, wherein the fan blade is a centrifugal fan blade. ### Claim 9 (depends on 8) The fan of claim 8, wherein each of the fan blades is forward-curved fan blade. ### Claim 10 (depends on 1) The fan of claim 1, further comprising a fan wheel and the fan blade is one or a plurality of fan blades provided on the fan wheel. ### Claim 11 (depends on 10) The fan of claim 10, wherein each of the fan blades extends in an axial direction from a fan wheel base and includes a radial inner end radially spaced from an axis of rotation of the fan wheel. ### Claim 12 (depends on 11) The fan of claim 11, wherein each of the fan blades is forward-curved fan blade. ### Claim 13 (depends on 10) The fan of claim 10, wherein each of the fan blades is forward-curved fan blade. ### Claim 14 (depends on 1) The fan of claim 1, wherein the pink noise sound profile is within 20% from a respective sound pressure level (dB) measured at each octave (Hz) of a pink noise curve measured along at least 7 additional octaves from a first octave. ### Claim 15 (depends on 14) The fan of claim 14, wherein the pink noise sound profile is within 10% from a respective sound pressure level (dB) measured at a second octave from the first octave of the pink noise curve in an increasing frequency direction to at least seven octaves from the first frequency in the increasing frequency direction. ### Claim 16 (depends on 15) The fan of claim 15, wherein the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being open allowing air to exit the housing through the outlet air vent and the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being closed precluding air to exit the housing through the outlet air vent. ### Claim 17 (depends on 16) The fan of claim 16, further comprising a shutter movable relative to the housing between an open position and a closed position, wherein the outlet air vent is open allowing air to exit the housing through the outlet air vent when the shutter is in the open position and the outlet air vent is covered precluding air to exit the housing through the outlet air vent when the shutter is in the closed position. ### Claim 18 (depends on 14) The fan of claim 14, wherein the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being open allowing air to exit the housing through the outlet air vent and the pink noise sound profile is generated when the fan blade is moving relative to the housing with the outlet air vent being closed precluding air to exit the housing through the outlet air vent. ### Claim 19 (depends on 18) The fan of claim 18, further comprising a shutter movable relative to the housing between an open position and a closed position, wherein the outlet air vent is open allowing air to exit the housing through the outlet air vent when the shutter is in the open position and the outlet air vent is covered precluding air to exit the housing through the outlet air vent when the shutter is in the closed position.