Structural element
Patent 4998391 Issued on March 12, 1991. Estimated Expiration Date: 
October 11, 2009. 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 11, 2009. 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 ReferencesPhosphorescent tread plate and composition Lightable nosing bar assembly for stairways Cleat for finishing off the ceramic tiles on a step Patent #: 4858404 InventorAssigneeApplicationNo. 399472 filed on 10/11/1989US Classes:52/179, Tread-nosing; e.g., shaped stair pad52/181Exposed embedded element or inserted fillerExaminersPrimary: Scherbel, David A.Assistant: Smith, Creighton Attorney, Agent or FirmInternational ClassE04F 015/00Foreign Application Priority Data1987-02-23 GBAbstractDevice for mounting on the tread (1) of a step of a staircase which comprises a generally planar member adapted to be mounted upon or adjacent the leading edge of the horizontal portion (the tread) of a step of a staircase and extending rearwardly over part or all of the width of the step, which rearwardly extending portion of the member is provided with a strip (14) of photoluminescent material. The invention also provides a flooring grade sheet plastic containing a photoluminescent material suitable for use in the device of the invention. | |
