Patent ID: 11952732
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E  B  G | IPC B  E  G

Claim 17:
18. A method of manufacturing a retro-reflective raised pavement marker, the method comprising the steps of:
producing a marker body with a top wall, a bottom wall, and a plurality of side walls such that at least one of the plurality of side walls connect edges of the top wall to edges of the bottom wall at an acute angle with respect to the top wall;
forming a plurality of ridges on the top wall and a plurality of undercut recesses on the bottom wall;
forming a lip portion, on the at least one of the plurality of side walls, at the edges of the bottom wall such that the ridges and the lip portion form a recessed portion on the at least one of the plurality of side walls;
fixing at least one intermediate frame, having weld lines, to the recessed portion of the at least one of the plurality of side walls, wherein the weld lines are inter-webbed to each other; and
fixing at least one retro-reflective lens to the at least one intermediate frame.