Non-slip luminescent device for surfaces such as stair treads
Patent 5103608 Issued on April 14, 1992. Estimated Expiration Date: 
February 22, 2011. 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.
February 22, 2011. 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 3334456 3589087 Stair nosing structure Escape/rescue system Pavement markings containing transparent non-vitreous ceramic microspheres Structural element Patent #: 4998391 InventorAssigneeApplicationNo. 658958 filed on 02/22/1991US Classes:52/179, Tread-nosing; e.g., shaped stair pad52/181Exposed embedded element or inserted fillerExaminersPrimary: Scherbel, David A.Assistant: Canfield, Robert Attorney, Agent or FirmInternational ClassE04F 015/00AbstractAn improved stair nosing device especially useful in temporarily darkened stairways is provided which includes a plate member with an upper surface, at least a portion of which is covered by luminescent material. The stair nosing device includes non-slip material attached to the upper surface to provide increased frictional contact with foot traffic relative to the plate member. The non-slip material is attached as spaced apart strips with an upper surface of the non-slip material being higher relative to the plate member. In this way the luminescent material is protected from damage by foot traffic.Other References
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