Apparatus for measuring the thickness of corneas
Patent 4598714 Issued on July 8, 1986. Estimated Expiration Date: 
July 8, 2003. 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.
July 8, 2003. 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 3371660 3827287 Apparatus for measuring the axial length of an eye Patent #: 4261367 InventorsAssigneeApplicationNo. 06/468289 filed on 02/22/1983US Classes:600/452, Ophthalmic73/612Plural gatingExaminersPrimary: Howell, Kyle L.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesA61B 8/10 (20060101)A61F 9/007 (20060101) A61F 9/013 (20060101) AbstractAn apparatus is disclosed for measuring the thickness of the corneas. 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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