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:
Dec. 10, 2019
Filed:
Oct. 20, 2011
William D. Coggio, Westford, MA (US);
Ramesh C. Kumar, Woodbury, MN (US);
John A. Wheatley, Lake Elmo, MN (US);
Michael L. Steiner, New Richmond, WI (US);
William F. Edmonds, Minneapolis, MN (US);
Lan H. Liu, Rosemount, MN (US);
Encai Hao, Woodbury, MN (US);
Robert F. Kamrath, Mahtomedi, MN (US);
John J. Stradinger, Roseville, MN (US);
William D. Coggio, Westford, MA (US);
Ramesh C. Kumar, Woodbury, MN (US);
John A. Wheatley, Lake Elmo, MN (US);
Michael L. Steiner, New Richmond, WI (US);
William F. Edmonds, Minneapolis, MN (US);
Lan H. Liu, Rosemount, MN (US);
Encai Hao, Woodbury, MN (US);
Robert F. Kamrath, Mahtomedi, MN (US);
John J. Stradinger, Roseville, MN (US);
3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US);
Abstract
An optical article includes an optical element, a low refractive index layer disposed on the optical element having an effective refractive index of 1.3 or less and a polymeric protective layer disposed on the low refractive index layer. The low refractive index layer includes a binder, a plurality of metal oxide particles dispersed in the binder, and a plurality of interconnected voids. The polymeric protective layer does not increase an effective refractive index of the optical article by greater than 10%.