Abstract: A virtual image generation system comprises a planar optical waveguide having opposing first and second faces, an in-coupling (IC) element configured for optically coupling a collimated light beam from an image projection assembly into the planar optical waveguide as an in-coupled light beam, a first orthogonal pupil expansion (OPE) element associated with the first face of the planar optical waveguide for splitting the in-coupled light beam into a first set of orthogonal light beamlets, a second orthogonal pupil expansion (OPE) element associated with the second face of the planar optical waveguide for splitting the in-coupled light beam into a second set of orthogonal light beamlets, and an exit pupil expansion (EPE) element associated with the planar optical waveguide for splitting the first and second sets of orthogonal light beamlets into an array of out-coupled light beamlets that exit the planar optical waveguide.

Abstract: A housing has a bud portion abutting an elongated stem portion. The bud portion is to fit within an ear. The bud portion has a primary sound outlet at its far end that is to be inserted into an outer ear canal, and abuts the stem portion at its near end. A speaker driver is inside the bud portion. Electronic circuitry inside the housing includes a wireless communications interface to receive audio content over-the-air and in response provides an audio signal to the speaker driver. A rechargeable battery as a power source for the electronic circuitry is located inside a cavity of the stem portion. Other embodiments are also described and claimed.

Abstract: A golf club head, preferably a putter head, comprising at least one structural support member is disclosed herein. The structural support member has a smooth, organic-looking aesthetic, with a continuously changing curvature along its spline and at least one surface, and preferably connects one portion of the golf club head to another portion. Where the support member connects to other portions of the golf club head, the surfaces of the member have a curvature that changes smoothly and continuously, lacking any sharp corners. The support member may be part of a lattice structure formed via binder jetting.

Abstract: A chin protection system for releasable attachment to a wide variety of helmets through the use of an elastically-deformable helmet cover, a pliable retainer, and a chin protector. The system safely attaches to a helmet without any modifications to the helmet and therefore does not impact the warranty or safety rating of the helmet. The helmet cover is designed to stretch and conform to numerous different helmet styles and manufacturers, while serving as an attachment point for the pliable retainer. The pliable retainer provides the tensile force necessary to keep the chin protector in place throughout the range of movement common during sporting activities, as well as during an impact to the chin. The chin protection system may be utilized on any safety helmet including, but not limited to, bike helmets, skateboard helmets, rollerblade helmets, ski/snowboard helmets, motorcycle helmets, go-cart helmets, baseball and softball helmets, and climbing helmets.

Abstract: A furan polymer concrete is described comprising aggregate, acid catalyst and binder which includes furfuryl alcohol and a crosslinking monomer. The binder has a low viscosity, thereby allowing significantly less binder to be used in forming the polymer concrete.