Abstract: A mattress covering in the form of a fitted mattress pad or fitted sheet has an inelastic, generally rectangular top portion and a skirt of inelastic material extending transversely, preferably perpendicularly from the outer periphery of the top portion in a closed loop entirely around the outer periphery of the top portion. A first elastic cord is secured to the skirt at its outer periphery remote from the top portion. A second, separate elastic cord is secured to the skirt at some place between and spaced apart from the top panel portion and the first elastic cord, preferably closer to the top portion outer periphery than to the first elastic cord. The skirt can be made of two layers of a textile material, each layer being a single panel, or it can be made of multiple panels or lengths of other materials for each layer.

Abstract: A developer cartridge is used with an image forming apparatus. The developer cartridge has a groove which formed in a longitudinal end surface of thereof and extends in an insertion direction of the cylinder. A strip-shaped projection formed in the image forming apparatus projects extends in the insertion direction. When the developer cartridge is fully inserted into the image forming apparatus, the groove receives the projection so that the projection is at a predetermined position relative to the developer cartridge. Two first walls define the groove which is progressively wide as the circumference is approached. A second wall rises from the longitudinal end surface of the developer cartridge and is continuous with one of the two first opposed walls. The second wall smoothly guides the projection into the groove.

Abstract: The present invention provides methods for detecting a working condition of a non-aqueous electrolyte secondary battery which allow easy and accurate determination of the degree of degradation and remaining capacity of the non-aqueous electrolyte secondary battery by a simple test irrespective of the past charging and discharging history of the battery. In the methods of the present invention, the degree of degradation of battery is quantitatively determined on the basis of the voltage value in charging or discharging at a constant current, or from an equation with that voltage value as variable.