The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanolamine salt produced by the reaction of a hydroxy carboxy acid, such as tartaric acid, gluconic acid or glucoheptonic acid, with an alkanolamine, ...

This is a surgical device particularly a perfusion catheter having an inflat ablemembrane or balloon located at the distal end of the catheter shaft. The catheter shaft is comprised of an outer tubing assembly and an inner tubing assembly separa ted by an open annulus for inflating and deflating the inflatable membrane. The ass embly may additionally comprise an inflatable membrane which is detach...

A setup to be used in a home theater or sound reproduction system for handling low frequency sound signals with a signal source providing several full bandwidth digital sound channels and at least one digital low frequency subwoofer channel includes a delay-and level control unit at least for each full bandwidth signal channel, which is equipped for a speaker not capable of reproducing low frequen...

A hearing aid, having alterable parameters includes analog-to-digital input circuitry for forming a digital signal representative of an incident acoustic wave. A digital signal processor, coupled to said input circuitry, forms and processes first and second, frequency distinguishable data streams representative, at least in part, of the digital signal, at a first rate, A control unit coupled to sa...

A computer-implemented method and apparatus for reparameterizing a parametric function representing an animation feature in an animation system where the parametric function is represented by a curve having unequal arc-length per unit parameter. The system samples at intervals of the parameter along the length of the curve and then calculates the arc-length over each interval. Thereafter, one or m...

A computer-implemented method for delaying the rendering of source material associated with a source layer in a nested composition that is a layer in a root composition. During the rendering of the root composition the method retrieves the source layer, promotes the source layer to the root layer and delays the rendering of the source material until the root layer is rendered.

A custom-made shoe of a sandal-type having a sole, an orthotic unit prescribed specially for the foot of the wearer adhered to the sole a vamp unit secured forwardly to the sole, and a counter secured to and projecting upwardly from the rear periphery of the sole.

When hay in the field is cut, it is left to dry before being baled. The hay stores better if its moisture content is low. To help the drying process a rake is often used to turn the cut hay. This may beraked several times if the weather prevents fast drying of the hay. In this invention, when the rake is attached to a tractor by means of a single point hitch, a lifting mechanism has been designed ...

The present invention relates an ionically conductive polymeric gel electrolyte for batteries having high ionic conductivity and sufficiently high solid strength. The invention has an object to provide a solid battery being excellent in characteristics of preventing internal short-circuit even if no diaphragm is used and having high reliability, by using the ionically conductive polymeric gel elec...