Interestingly enough it looks like Cree has a patent on blue LEDs.
- Osram GmbH Cross-license agreement to all patents in the fields of blue LED chip technology, white LEDs and phosphors, packaging, LED luminaires and lamps, and LED lighting control systems. 04/04/2011
- Philips
(Koninklijke Philips Electronics N.V.) Cross-license agreement to all patents covering blue LED chips, white LEDs and phosphors (including remote phosphors), control systems, LED luminaires and lamps as well as LED backlighting of liquid crystal displays (LCDs) and patents in the Philips LED Luminaire Licensing Program. 07/07/2010
- Rohm Co., Ltd. License to U.S. 6,600,175 to make and sell white LEDs that incorporate Cree LED chips. 05/19/2005
Seoul Semiconductor, Inc. License to manufacture and sell white-emitting packaged LED lamps each of which incorporate an LED chip from Cree and a phosphor and is encompassed by U.S. 6,600,175 and patents that issue from US. Ser. Nos. 10/623,198 and 11/264,124
- Epistar
Cross license agreement to LED chip patents. 08/04/2015