Personal speedometer
May 28, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3898878 Method and device for measuring the flow velocity of media by means of ultrasound Acoustical flow meter Ultrasonic flowmeter Flowmeter system with digital phase shifter and calibration Ultrasonic flowmeter Ultrasonic air flowmeter for motor vehicles Measuring apparatus for the automatic measurement of speed, travelled distance and directional changes of a movable body Digital flow meter circuit and method for measuring flow Speed measurement device InventorApplicationNo. 653919 filed on 05/28/1996US Classes:73/597, Velocity or propagation time measurement73/861.28Transmitted along single pathExaminersPrimary: Brock, MichaelAssistant: Ashraf, Nashmiya Attorney, Agent or FirmInternational ClassG01N 029/02AbstractThe speed of an object is measured using a device which includes a transmitter spaced a predetermined distance from a receiver. A first sound wave is propagated through air with a first velocity, typically zero velocity. A second sound wave is propagated through air, the air having a second velocity which approximately equals the air speed of the object. The difference in time between the two sound waves reaching the receiver is measured and used to calculate the air speed of the object, which is then displayed to the user. The device is readily mounted on a pair of glasses wherein the user can read the displayed air speed without involving the user's hands. | |
