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. 27, 2007
Filed:
Dec. 28, 2004
Chester A. Bacon, Jr., Oakdale, MN (US);
Seth M. Kirk, Minneapolis, MN (US);
Moses M. David, Woodbury, MN (US);
Michael D. Currens, Eagan, MN (US);
Osei A. Owusu, Woodbury, MN (US);
Chester A. Bacon, Jr., Oakdale, MN (US);
Seth M. Kirk, Minneapolis, MN (US);
Moses M. David, Woodbury, MN (US);
Michael D. Currens, Eagan, MN (US);
Osei A. Owusu, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A prismatic retroreflective article has a transparent body portion and a layer of internally reflecting cube-corner optical elements having an open air-exposed rear surface at least a portion of which is more hydrophobic, more oleophobic, or both more hydrophobic and more oleophobic than the underlying cube-corner optical element. The article may be made by providing a transparent body portion bearing a layer of internally reflecting open air-exposed cube-corner optical elements; treating or coating at least a portion of the cube-corner elements to make the treated or coated portion more hydrophobic, more oleophobic, or both more hydrophobic and more oleophobic than the underlying cube-corner optical elements; and leaving such treated or coated portion exposed to the open air.