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:
Feb. 28, 1989
Filed:
Jan. 04, 1988
Applicant:
Inventor:
Raymond E Grunzinger, St. Paul, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
428325 ; 428327 ; 4284231 ; 4284233 ; 428913 ; 528 60 ; 528 65 ; 528 66 ;
Abstract
The novel retroreflective sheeting has a flat transparent top coat which is as tough and as resistant to solvents and abrasion as are alkyd resins, and as weather resistant as are acrylic polyesters. That top coat is made from a mixture of hydroxy-functional acrylic polyol and a curing agent which is an aliphatic polyfunctional isocyanate such as the biuret of 1,6-hexamethylene diisocyanate. The retroreflective sheeting may have a dual-layer top coat, the outer layer being relatively hard to provide good resistance to solvents, abrasion and weathering, and the inner layer being softer to make the sheeting more conformable.