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...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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US Patent 6715984 - Stall prediction method for axial flow compressor
US Patent Issued on April 6, 2004
Estimated Patent Expiration Date:
June 10, 2022Estimated 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.
Estimated Patent Expiration Date:
June 10, 2022Estimated 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.AbstractIn order to provide a stall prediction method for an axial flow compressor, a high response pressure sensor is provided in a duct wall adjacent to the leading edge of the rotor blade and a rotating stall is predicted by computing autocorrelation of pressure data obtained as a time history data. The initiation of rotating stall is determined when the autocorrelation of the time history data starts dropping rapidly. When it is determined that the rotating stall is imminent, generation of the rotating stall is prevented by taking necessary countermeasures such as to reduce the fuel supply. | InventorsAssigneeApplicationNo. 10165927 filed on 06/10/2002US Classes:415/1, METHOD OF OPERATION415/118, WITH INSPECTION, SIGNALING, INDICATING OR MEASURING MEANS415/914DEVICE TO CONTROL BOUNDARY LAYERField of Search415/1, METHOD OF OPERATION415/118, WITH INSPECTION, SIGNALING, INDICATING OR MEASURING MEANS415/914, DEVICE TO CONTROL BOUNDARY LAYER416/42, Pressure or altitude responsive416/61WITH MEASURING, TESTING, SIGNALLING OR INSPECTION MEANSExaminersPrimary: Nguyen, Ninh H.Attorney, Agent or FirmUS Patent References5915917, Compressor stall and surge control using airflow asymmetry measurementIssued on: 06/29/1999 Inventor: Eveker, et al.6098010, Method and apparatus for predicting and stabilizing compressor stall Issued on: 08/01/2000 Inventor: Krener, et al.6231306Control system for preventing compressor stall Issued on: 05/15/2001 Inventor: Khalid International ClassF01D 2500 |
