Apparatus to measure conical thickness
Patent 4546773 Issued on October 15, 1985. Estimated Expiration Date: 
May 7, 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.
May 7, 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 References 2708847 3232099 3827287 Transducer probe for pulse-echo ultrasonic exploration Contact lens corneal cutter Transducer assembly Apparatus for measuring the axial length of an eye Patent #: 4261367 InventorsAssigneeApplicationNo. 06/607603 filed on 05/07/1984US Classes:600/452OphthalmicExaminersPrimary: Howell, Kyle L.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesH03K 5/04 (20060101)A61B 8/10 (20060101) A61F 9/007 (20060101) A61F 9/013 (20060101) AbstractAn apparatus is disclosed for measuring the thickness of the cornea and for regulating the depth of a surgical blade in relation to the local corneal thickness. Corneal thickness is measured by first directing ultrasonic pulses towards the cornea and timing the interval between reflected pulses. The apparatus also includes a pulse stretcher for enlarging the width of the pulse representing the interval between pulses reflected from the inner and the outer surfaces of the cornea, so that the time between pulses can be accurately measured by a conventional, low-frequency electronic clock. The invention further comprises electronic gating means for rejecting spurious pulses.Other References
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