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US 7,458,694 B2Granted
Method of making retroreflective sheeting and articles
Assignee3M Innovative Properties Company
InventorKenneth L. Smith
Life of this patent
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Abstract
The invention relates to a method of making retroreflective sheeting and other articles prepared from casting a moldable synthetic resin onto a tool having a microstructured surface.
Claims16
A method of making retroreflective sheeting comprising:
- providing a tool comprising a PG cube corner microstructured surface with at least one channel;
- advancing the tool or a dispensing device in a direction;
- casting a moldable resin onto the tool surface such that the channel is substantially parallel to the direction of filling of the channel;
- solidifying the resin forming a retroreflective sheeting having a surface comprising cube corner elements;
- and
- removing the sheet from the tool.
3 more elements
Dependencies are inferred from the claim text.