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:
Jul. 05, 2022
Filed:
Sep. 05, 2019
3m Innovative Properties Company, St. Paul, MN (US);
Ying Lin, Woodbury, MN (US);
Sheng Ye, Redmond, WA (US);
Timothy D. Dunbar, Woodbury, MN (US);
Bradley D. Craig, Lake Elmo, MN (US);
Dong-Wei Zhu, North Oaks, MN (US);
Matthew J. Kryger, Hudson, WI (US);
Richard J. Pokorny, Maplewood, MN (US);
Michael A. Kropp, Cottage Grove, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A curable composition that includes a urethane multifunctional (meth)acrylate, an inorganic filler having a primary particle dimension of at least 200 nm, a photoinitiator system that can be activated by electromagnetic radiation in the range of 340-550 nm, a reactive diluent, and a reinforcing silica having a primary particle dimension of 100 nm of less. The sum of the absolute value of the difference in the refractive index of the filler and the refractive index of the composition cured without filler plus the birefringence of the filler is 0.054 or less, i.e. 0.054≥|n−n|+δ, where nis the refractive index of the filler, nis the refractive index of the composition cured without filler, and δis the birefringence of the filler.