Flexible raised pavement marker
US5069577A · kind A · utility
Inventor
Key dates
| Filing date | Oct 23, 1990 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Oct 23, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01F9/571
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Raised pavement marker useful in geographic areas where snow plows are used and comprising hollow base with an open bottom and dome top, characterized by: PA1 A. base cross section being closed curved shape like cylinder; PA1 B. dome having: PA2 1) outer surface which approximates surface of rotation of a sine wave with highest point in middle of dome; PA2 2) dome cross section is thickest near center and thinnest at p eriphery; PA2 3) at least 2 ribs projecting from surface, to protect reflector which may be cube corner reflectror affixed to dome; PA1 C. material of construction which is an elastomer having T.sub.g no greater than -50.degree. C., preferably polyurethane compound containing a lubricating polymer, such as a silicone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.