Airspeed display scale with integral trend indication
Patent 4415974 Issued on November 15, 1983. Estimated Expiration Date: 
June 11, 2001. 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.
June 11, 2001. 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 3128445 Aircraft instruments Take-off director system Patent #: 4251868 InventorsApplicationNo. 06/272624 filed on 06/11/1981US Classes:701/70, Indication or control of braking, acceleration, or deceleration340/969, Speed340/978, Speed345/35, Bar graph701/14, Flight condition indicating system701/15, With indication or control of take-off701/16With indication or control of landingExaminersPrimary: Shaw, Gareth D.Assistant: Dwork, Stuart D. Attorney, Agent or FirmInternational ClassesG01R 13/40 (20060101)G01P 1/00 (20060101) G01R 13/00 (20060101) G01P 1/08 (20060101) AbstractA digitally activated display scale in association with digital-electronic ircuitry, displays both the airspeed and airspeed trend of a landing aircraft. The digital/electronic circuitry process an analog voltage corresponding to an airspeed range of 80 to 179 knots to produce a digital number representative of the airspeed of the landing aircraft. The digital number is used to produce a continuous display of the airspeed and to indicate the trend of the airspeed as either increasing or decreasing. | |
