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:
May. 25, 2021
Filed:
May. 30, 2017
3m Innovative Properties Company, St. Paul, MN (US);
John A. Wheatley, Stillwater, MN (US);
Gilles J. Benoit, Minneapolis, MN (US);
Todd A. Ballen, St. Paul, MN (US);
Kenneth L. Smith, White Bear Lake, MN (US);
Guanglei Du, Painted Post, NY (US);
Edward J. Kivel, Stillwater, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
Jordan D. Whitney, Oakdale, MN (US);
Daniel J. Schmidt, Woodbury, MN (US);
3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US);
Abstract
An optical filter including a polarizer and a visible light blocking filter is described. The polarizer is configured to transmit at least 60 percent of light in a first infrared wavelength range that is incident on the polarizer at normal incidence in a first polarization state, to transmit less than 30 percent of light in a second infrared wavelength that is incident on the polarizer at normal incidence in a second polarization state orthogonal to the first polarization state, and to transmit less than 30 percent of light in a third infrared wavelength range that is incident on the polarizer with a 50 degree angle of incidence in the second polarization state. The visible light blocking filter configured to transmit at least 60 percent of light in the first infrared wavelength range at normal incidence in the first polarization state.