Elevator call buttons having plural illuminated indications of availability and use
Patent 5454448 Issued on October 3, 1995. Estimated Expiration Date: 
October 21, 2012. 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.
October 21, 2012. 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 ReferencesElevator control switch and position indicator assembly Elevator system floor call registering circuit Elevator call registering and indicating device Patent #: 4915197 InventorsAssigneeApplicationNo. 964540 filed on 10/21/1992US Classes:187/395, HAVING CALL BUTTON WITH INDICATOR187/384Having security or priority preemption featureExaminersPrimary: Dougherty, Thomas M.Assistant: Nappi, Robert E. Foreign Patent References
International ClassesB66B 001/14B66B 003/00 AbstractElevator car call buttons and hall call buttons are illuminated in a first fashion (such as a first color or intermittent flashing) to indicate that the service corresponding to that call button is available to passengers (while buttons corresponding to unavailable service would have either no illumination or different illumination); the buttons then become illuminated in a distinctly different way when a service call corresponding to that button has been registered. The illumination may be thin rings surrounding the call button switch or the call button switch itself; many variations of color, position, and flashing vs. steady are disclosed.Other References
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