Abstract: A converter device for converting signals between an RS-232 device and an RS-422 device. The converter device can either be self-powered, using signals at the I/O port of the RS-232 device to derive its operating voltages, or can be powered by an external voltage source when the I/O signals are not of sufficient magnitude to derive the operating voltages or there are a large number of devices connected in parallel by the converter device.

Abstract: A paint composition for inhibiting corrosion of a metal surface includes a powdered sacrificial metal for that surface and a powdered water soluble corrosion inhibiting glass. Typically the paint is a zinc rich paint and the glass is a calcium/zinc phosphate glass.

Abstract: A composite material for the controlled release of an active substrate comprises a relatively insoluble, e.g. polymeric, matrix (11) in which a soluble particulate material (12) is dispersed. When the composite is placed in an aqueous medium dissolution of the particulate material substantially increases the water permeability of the matrix. This effect may be used to provide for the controlled release of an active material into the aqueous medium.

Abstract: Corrosion inhibiting compositions for ferrous and non-ferrous metal surfaces comprise one or more crystalline polyphosphates, e.g. a strontium tripolyphosphate. The compositions have particular application in the preparation of corrosion inhibiting paint compositions. A method of preparation of the polyphosphate materials is described.

Abstract: An animal feed additive comprises a composite of a relatively insoluble binder, a particulate soluble material and an active material. The particulate material is such that it is readily soluble under a particular range of pH conditions, e.g. under said conditions. Dissolution of the particulate material renders the binder water permeable thus permitting release of the active material.

Abstract: A soccer training apparatus utilizes a hollow handle portion having a shaft upon which one end of a flexible line may be wound. The shaft, contained within the handle, is biased by a helical spring so as to rotate in a preferred direction. A ratchet and a manually releasable pawl permits the line to be unwound from the shaft when a force exerted on the line overcomes the bias force of the spring. The other end of the line is secured to a solid rubber-like ball by passing through an elongated opening in the ball and engaging one end of a coil spring residing in the passageway. The other end of the coil spring is prevented from emerging from the passageway by a shoulder therein. A knot in the line prevents the line from leaving the confines of the passageway. In use, a casting force exerted on the handle, permits the ball to extend in the direction of the cast. Releasing the pawl permits the line to rewind on the shaft under the control of the helical spring, thus returning the ball to the user after casting.