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:
Apr. 07, 2015
Filed:
Jun. 25, 2009
John Roberts, Grand Rapids, MI (US);
Gerald H. Negley, Chapel Hill, NC (US);
Antony P. Van DE Ven, Sai Kung, HK;
Arpan Chakraborty, Goleta, CA (US);
Bernd Keller, Santa Barbara, CA (US);
Ronan P. Le Toquin, Ventura, CA (US);
John Roberts, Grand Rapids, MI (US);
Gerald H. Negley, Chapel Hill, NC (US);
Antony P. van de Ven, Sai Kung, HK;
Arpan Chakraborty, Goleta, CA (US);
Bernd Keller, Santa Barbara, CA (US);
Ronan P. Le Toquin, Ventura, CA (US);
Cree, Inc., Durham, NC (US);
Abstract
A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED. Chromaticities of the first and second LEDs are selected so that a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity. The first LED may include a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip. The second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, and in particular may have a yellow green, greenish yellow or green hue.