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Cube corner sheeting mold and method of making the same    
United States Patent6257860   
Link to this pagehttp://www.wikipatents.com/6257860.html
Inventor(s)Luttrell; Dan E. (Corning, NY); Erwin; Robert L. (Rohnert Park, CA); Smith; Kenneth L. (White Bear Lake, MN); Benson; Gerald M. (Woodbury, MN)
AbstractLaminae suitable for use in molds for forming retroreflective cube corner elements and methods for making such laminae are disclosed. A representative lamina includes a first row of cube corner elements disposed in a first orientation and a second row of optically opposing cube corner elements disposed. The working surface of a lamina is provided with a plurality of cube corner elements formed by the optical surfaces defined by three groove sets. Opposing first and second groove sets are formed in the working surface of a lamina. The first groove set forms a plurality of structures having first and second optical surfaces disposed in mutually perpendicular planes that intersect along a reference edge. The second groove set forms a corresponding plurality of structures on the opposite side of the lamina. A third groove is formed in the working surface of the lamina along an axis substantially perpendicular to the axes of the grooves of the first and second groove sets. The surfaces of the third groove intersect the surfaces of the plurality of structures in substantially mutually perpendicular planes to define a plurality of cube corner elements. A plurality of such laminae can be assembled to form a mold useful in the manufacture of retroreflective products such as cube corner sheeting.



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Drawing from US Patent 6257860
Cube corner sheeting mold and method of making the same - US Patent 6257860 Drawing
Cube corner sheeting mold and method of making the same
Inventor     Luttrell; Dan E. (Corning, NY); Erwin; Robert L. (Rohnert Park, CA); Smith; Kenneth L. (White Bear Lake, MN); Benson; Gerald M. (Woodbury, MN)
Owner/Assignee     3M Innovative Properties Company (St. Paul, MN)
Patent assignment
All assignments
Publication Date     July 10, 2001
Application Number     09/636,730
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     August 10, 2000
US Classification     425/193 249/117 249/160 264/1.9 264/2.5 359/529 425/470 425/DIG.30
Int'l Classification     B41B 011/54 B29D 011/00
Examiner     Smith; Duane S.
Assistant Examiner    
Attorney/Law Firm     Jensen; Stephen C. Schwappach; Karl G. , Caven; Jed W. ,
Address
Parent Case     CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of U.S. patent application Ser. No. 08/886,074, filed Jul. 2, 1997, now abandoned.
Priority Data    
USPTO Field of Search     204/1.9 204/2.5 204/1.31 204/1.33 204/1.34 425/193 425/195 425/470 425/DIG. 30 249/117 249/156 249/157 249/160 249/163 359/529
Patent Tags     cube corner sheeting mold making
   
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