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US 4,988,555 AGranted
Patterned pavement marking
AssigneeMinnesota Mining and Manufacturing Company
InventorThomas P. Hedblom
Life of this patent
Estimating the term…
Abstract
A retroreflector sheet comprising a base sheet and integral protrusions having a top and a side surface. Selected side surfaces are covered with a bead bond layer including partially embedded retroreflector beads. A process for preparing the retroreflector sheet is also disclosed.
Claims10
A retroreflective sheet comprising:
- a resilient polymeric base sheet having a front surface;
- a plurality of integral protrusions projecting from the front surface, there being a plurality of such protrusions across the width and down the length of the sheet, each of the protrusions having a top surface and at least one side surface connecting the top surface to the front surface of the base sheet;
- a first discontinuous layer of bead bond covering a selected set of side surfaces of each of the protrusions;
- and
- a first plurality of retroreflecting beads partially embedded in the layer of bead bond and partially protruding from the layer of bead bond,
- said retroreflective sheet being characterized in that said selected set of side surfaces is covered by a combination of bead bond and retroreflecting beads absent from the remaining front surface between the protrusions.
3 more elements
A retroreflective sheet comprising:
- a resilient polymeric base sheet having a front surface;
- a plurality of integral protrusions projecting from the front surface, there being a plurality of such protrusions across the width of the sheet, each of the protrusions having a top surface and at least one side surface connecting the top surface to the front surface of the base sheet;
- a first discontinuous layer of bead bond covering a selected set of side surfaces of the protrusions;
- a first plurality of retroreflecting beads partially embedded in the layer of bead bond and partially protruding from the layer of bead bond;
- a second layer of bead bond covering a second selected set of side surfaces of the protrusions;
- and
- a second plurality of particles partially embedded in the second layer of bead bond, the combination of said second bead bond and said second plurality of particles being substantially different from the combination of said first layer of bead bond and said first plurality of retroreflective beads.
4 more elements
A retroreflective sheet which comprises:
- a resilient polymeric base sheet having a front surface;
- a plurality of integral protrusions projecting from the front surface, there being a plurality of such protrusions across the width of the sheet, each of the protrusions having a top surface and at least one side surface connecting the top surface to the front surface of the base sheet;
- a first discontinuous layer of bead bond covering a selected set of side surfaces of the protrusions;
- a first plurality of retroreflecting beads partially embedded in the first layer of bead bond and partially protruding from the first layer of bead bond;
- a second layer of bead bond covering the top surfaces of the protrusions;
- and
- a plurality of skid prevention particles partially embedded in the second layer of bead bond.
4 more elements
Dependencies are inferred from the claim text.