Rounded wall surface acoustic wave sensors
Patent 4622854 Issued on November 18, 1986. Estimated Expiration Date: 
December 31, 2004. 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.
December 31, 2004. 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 ReferencesDevice for measuring the flow rate of a fluid and air flow sensor system in an internal combustion engine utilizing such a device Surface acoustic wave sensors Patent #: 4535631 InventorsAssigneeApplicationNo. 06/687715 filed on 12/31/1984US Classes:73/703, Ultrasonic29/25.35, PIEZOELECTRIC DEVICE MAKING310/313B, Interdigitated electrodes310/338, Force or pressure measuring type73/708, With pressure and/or temperature compensation73/729.2CapsuleExaminersPrimary: Woodiel, Donald O.Attorney, Agent or FirmInternational ClassG01L 9/00 (20060101)AbstractDisclosed is an externally loaded pressure sensor using a pair of SAW devices formed on the wall of an interior cavity. The difference frequency of these devices is used as a temperature-compensated measure of hydrostatic pressure on the sensor exterior. The cavity wall immediately adjacent the long sides of at least one of the SAW devices is rounded, to improve pressure sensitivity without unacceptable increase in stresses or other adverse effects. | |
