Phoropter
Patent 4385813 Issued on May 31, 1983. Estimated Expiration Date: 
April 15, 2002. 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.
April 15, 2002. 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 1873356 Refractor cross-cylinder apparatus Patent #: 4185896 InventorsAssigneeApplicationNo. 06/368698 filed on 04/15/1982US Classes:351/217, On rotary disc351/235Having plural disc carrierExaminersPrimary: Corbin, John K.Assistant: Bovernick, Rodney B. Attorney, Agent or FirmInternational ClassesA61B 3/028 (20060101)A61B 3/036 (20060101) A61B 3/02 (20060101) Foreign Application Priority Data1979-01-16 DEAbstractMethod for obtaining cross cylinder-like actions for using the adjusting or aligning measurement known as the cross cylinder method in phoropters for subjective refraction, wherein the spherical and cylindrical lens discs of the phoropter are adjusted in preprogrammed manner to cross cylinder-like lens systems.The set problem is also solved by a phoropter with spherical test lenses and cylindrical lenses arranged on lens discs and which can be introduced into the observation optical path, wherein the motor drives of the lens discs are combined in a program control unit, connected to an operating unit and an indicating unit. | |
