The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1999
Filed:
Apr. 10, 1996
Applicant:
Inventors:
Deana A Klein, Maplewood, MN (US);
Carol-Lynn Spawn, West Lakeland Township, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B32B / ; G02B / ;
U.S. Cl.
CPC ...
428161 ; 428172 ; 428187 ; 428206 ; 428209 ; 428210 ; 4284231 ; 4284242 ; 4284244 ; 4284248 ; 4284256 ; 428502 ; 428913 ; 4289133 ; 428914 ; 4271634 ; 427180 ; 427202 ; 427203 ; 359529 ; 359534 ; 359535 ; 359536 ; 359538 ; 359540 ; 359541 ;
Abstract
The present invention provides a retroreflective sheeting including: optical elements arranged in substantially a monolayer; a spacing layer in which the optical elements are at least partially embedded; a specularly reflecting layer underlying the spacing layer; and a bead bond layer in which the optical elements are at least partially embedded. The bead bond layer includes an aminoplast-crosslinked polymer comprising urethane groups, wherein prior to crosslinking the polymer has a glass transition temperature (Tg) of less than about 0.degree. C.