Apple's patent titled: Combining power from multiple resonance magnetic receivers in resonance magnetic power system
A wireless power unit arranged to provide at least a minimum amount of power to a device wirelessly received from a magnetic field provided by a near field magnetic resonance (NFMR) transmitter unit having a resonance frequency .omega..sub.T, the minimum amount of power delivered to the device being independent of a spatial orientation of the portable power unit with respect to the magnetic field, comprising: a first resonator structure, the first resonator structure having a resonant frequency .omega..sub.1, and a characteristic size L.sub.1; a second resonator structure, the second resonator structure having a resonant frequency .omega..sub.2, and a characteristic size L.sub.2, wherein the first and second resonator structures are magnetically decoupled such that an effective magnetic coupling coefficient .kappa.eff between the first and second resonator structures is about zero; and a power combining circuit coupled to the magnetically decoupled first and second resonator structures arranged to: load match the first and second resonator structures and the device, load balance power from the first and second resonator structures, and maintain an effective magnetic coupling coefficient between the first and second resonator structures at about zero regardless of a spatial orientation of the wireless power unit with regards to the NFMR magnetic field such that the device wirelessly receives the at least the minimum amount of power from the wireless power unit regardless of an orientation of the at least two NFMR power receivers with respect to the NFMR magnetic field.
The '885 patent has an interesting incorporation by reference:
As described in Annals of Physics 323 (2008) 34-48 "Efficient Wireless Non-Radiative Mid-range Energy Transfer" by Aristeidis Karalis et al., available online Apr. 27, 2007, that is incorporated by reference in its entirety for all purposes, useable power can be transferred wirelessly from a power source to a receiver located within a distance referred to as a near field.
The priority for the Apple patent is -- U.S. Provisional Application Ser. No. 61/491,844, filed May 31, 2011 --
The case involved an RCE, and the amendments to the "Background" section of the specification made on March 4, 2014 are of interest.
The case is also of interest because it relied upon the Patent Prosecution Highway [PPH] based upon a favorable report from the Korean Patent Office [KIPO] of the claims of PCT /US2011/038640.