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:
Nov. 09, 2004
Filed:
Oct. 24, 2001
Mark J. Pellerite, Woodbury, MN (US);
Susannah C. Clear, Hastings, MN (US);
Cheryl L. Elsbernd, Woodbury, MN (US);
Richard M. Flynn, Mahtomedi, MN (US);
George Van Dyke Tiers, St. Paul, MN (US);
Naiyong Jing, Woodbury, MN (US);
3M Innovative Properites Company, St. Paul, MN (US);
Abstract
The present invention relates to optical elements comprising fluorochemical surface treatments. The invention further relates to materials such as retroreflective sheetings, pavement markings and beaded projection screens comprising a binder and the surface treated optical elements. The fluorochemical surface treatment is substantially free of perfluoroalkyl groups having more than four carbon atoms. Preferably, the surface treatment is a polyfluoropolyether-based compound comprising at least one polar group or polar group-containing organic radical.