Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1993-10-20
1996-12-17
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428161, 428167, 428172, 428212, 428221, 359530, 359534, 359535, B32B 300
Patent
active
055851649
ABSTRACT:
A retroreflective cube corner article which is a replica of a directly machined substrate in which a plurality of geometric structures including cube corner elements are machined in the substrate using only two sets of parallel grooves. At least two of the grooves in at least one of the groove sets are at a different groove depth.
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Minnesota Mining and Manufacturing Company
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